"Fifth wheel, a horizontal plate, bent to form a whole or part of a circle, placed on the forward axle of a carriage. It is designed to support the fore part of the body while allowing it to turn freely in a horizontal plane." Today, the fifth wheel is used in coupling of trailers and towing trucks. -Whitney, 1911

Fifth Wheel

"Fifth wheel, a horizontal plate, bent to form a whole or part of a circle, placed on the forward axle…

"Fifth wheel, a horizontal plate, bent to form a whole or part of a circle, placed on the forward axle of a carriage. It is designed to support the fore part of the body while allowing it to turn freely in a horizontal plane." Today, the fifth wheel is used in coupling of trailers and towing trucks. -Whitney, 1911

Fifth Wheel

"Fifth wheel, a horizontal plate, bent to form a whole or part of a circle, placed on the forward axle…

"A Truck Rollover Warning sign may be used to warn drivers of vehicles with a high center of gravity, such as trucks, tankers, and recreational vehicles, of a curve or turn having geometric conditions that are prone to cause such vehicles to lose control and overturn. When the Truck Rollover Warning sign is used, it shall be accompanied by an Advisory Speed plaque indicating the recommended speed for vehicles with a higher center of gravity."

Truck Rollover Warning, Black and White

"A Truck Rollover Warning sign may be used to warn drivers of vehicles with a high center of gravity,…

"A Truck Rollover Warning sign may be used to warn drivers of vehicles with a high center of gravity, such as trucks, tankers, and recreational vehicles, of a curve or turn having geometric conditions that are prone to cause such vehicles to lose control and overturn. When the Truck Rollover Warning sign is used, it shall be accompanied by an Advisory Speed plaque indicating the recommended speed for vehicles with a higher center of gravity."

Truck Rollover Warning, Color

"A Truck Rollover Warning sign may be used to warn drivers of vehicles with a high center of gravity,…

"A Truck Rollover Warning sign may be used to warn drivers of vehicles with a high center of gravity, such as trucks, tankers, and recreational vehicles, of a curve or turn having geometric conditions that are prone to cause such vehicles to lose control and overturn. When the Truck Rollover Warning sign is used, it shall be accompanied by an Advisory Speed plaque indicating the recommended speed for vehicles with a higher center of gravity."

Truck Rollover Warning, Outline

"A Truck Rollover Warning sign may be used to warn drivers of vehicles with a high center of gravity,…

"A Truck Rollover Warning sign may be used to warn drivers of vehicles with a high center of gravity, such as trucks, tankers, and recreational vehicles, of a curve or turn having geometric conditions that are prone to cause such vehicles to lose control and overturn. When the Truck Rollover Warning sign is used, it shall be accompanied by an Advisory Speed plaque indicating the recommended speed for vehicles with a higher center of gravity."

Truck Rollover Warning, Silhouette

"A Truck Rollover Warning sign may be used to warn drivers of vehicles with a high center of gravity,…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. The TRUCK CROSSING word message sign may be used as an alternate to the Truck Crossing symbol sign.

Truck Crossing, Black and White

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. The TRUCK CROSSING word message sign may be used as an alternate to the Truck Crossing symbol sign.

Truck Crossing, Color

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. The TRUCK CROSSING word message sign may be used as an alternate to the Truck Crossing symbol sign.

Truck Crossing, Outline

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. The TRUCK CROSSING word message sign may be used as an alternate to the Truck Crossing symbol sign.

Truck Crossing, Silhouette

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist.

Golf Cart Crossing, Black and White

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist.

Golf Cart Crossing, Color

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist.

Golf Cart Crossing, Outline

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist.

Golf Cart Crossing, Silhouette

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist.

Horse-Drawn Vehicles, Black and White

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist.

Horse-Drawn Vehicles, Color

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist.

Horse-Drawn Vehicles, Outline

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist.

Horse-Drawn Vehicles, Silhouette

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist.

Farm Equipment, Black and White

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist.

Farm Equipment, Color

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist.

Farm Equipment, Outline

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist.

Farm Equipment, Silhouette

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist.

Farm Equipment, Black and White

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist.

Farm Equipment, Color

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist.

Farm Equipment, Outline

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist.

Farm Equipment, Silhouette

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist. The Emergency Vehicle sign with the EMERGENCY SIGNAL AHEAD supplemental plaque shall be placed in advance of all emergency-vehicle traffic control signals.

Fire Station, Black and White

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist. The Emergency Vehicle sign with the EMERGENCY SIGNAL AHEAD supplemental plaque shall be placed in advance of all emergency-vehicle traffic control signals.

Fire Station, Color

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist. The Emergency Vehicle sign with the EMERGENCY SIGNAL AHEAD supplemental plaque shall be placed in advance of all emergency-vehicle traffic control signals.

Fire Station, Outline

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the roadway by trucks, bicyclists, farm vehicles, emergency vehicles, golf carts, horse-drawn vehicles, or other vehicles might occur. These locations might be relatively confined or might occur randomly over a segment of roadway. Vehicular Traffic signs should be used only at locations where the road user's sight distance is restricted, or the condition, activity, or entering traffic would be unexpected. If the condition or activity is seasonal or temporary, the Vehicular Traffic sign should be removed or covered when the condition or activity does not exist. The Emergency Vehicle sign with the EMERGENCY SIGNAL AHEAD supplemental plaque shall be placed in advance of all emergency-vehicle traffic control signals.

Fire Station, Silhouette

Vehicular Traffic signs may be used to alert road users to locations where unexpected entries into the…

"Selective Exclusion signs give notice to road users that State or local statutes or ordinances exclude designated types of traffic from using particular roadways or facilities."-Federal Highway Administration, 2007

No Trucks, Black and White

"Selective Exclusion signs give notice to road users that State or local statutes or ordinances exclude…

"Selective Exclusion signs give notice to road users that State or local statutes or ordinances exclude designated types of traffic from using particular roadways or facilities."-Federal Highway Administration, 2007

No Trucks, Color

"Selective Exclusion signs give notice to road users that State or local statutes or ordinances exclude…

"Selective Exclusion signs give notice to road users that State or local statutes or ordinances exclude designated types of traffic from using particular roadways or facilities."-Federal Highway Administration, 2007

No Trucks, Outline

"Selective Exclusion signs give notice to road users that State or local statutes or ordinances exclude…

"Selective Exclusion signs give notice to road users that State or local statutes or ordinances exclude designated types of traffic from using particular roadways or facilities."-Federal Highway Administration, 2007

No Trucks, Silhouette

"Selective Exclusion signs give notice to road users that State or local statutes or ordinances exclude…

"The National Network Prohibition sign may be used to identify routes, portions of routes, and ramps where trucks are prohibited. The sign may also be used to mark the ends of designated routes."-Federal Highway Administration, 2007

National Network Prohibition, Black and White

"The National Network Prohibition sign may be used to identify routes, portions of routes, and ramps…

"The National Network Prohibition sign may be used to identify routes, portions of routes, and ramps where trucks are prohibited. The sign may also be used to mark the ends of designated routes."-Federal Highway Administration, 2007

National Network Prohibition, Black and White

"The National Network Prohibition sign may be used to identify routes, portions of routes, and ramps…

"The National Network Prohibition sign may be used to identify routes, portions of routes, and ramps where trucks are prohibited. The sign may also be used to mark the ends of designated routes."-Federal Highway Administration, 2007

National Network Prohibition, Outline

"The National Network Prohibition sign may be used to identify routes, portions of routes, and ramps…

"The National Network Prohibition sign may be used to identify routes, portions of routes, and ramps where trucks are prohibited. The sign may also be used to mark the ends of designated routes."-Federal Highway Administration, 2007

National Network Prohibition, Silhouette

"The National Network Prohibition sign may be used to identify routes, portions of routes, and ramps…

In many cases, pickup trucks and tractors are outfitted with plows to fulfill this purpose. In areas that regularly receive large amounts of snow every year, and also in specific environments such as airfield, specifically snowplowing winter service vehicles are used. Some regions that do not frequently see snow may use graders and other equipment to fulfill this task, but graders are nonetheless the best equipment to remove compacted snow and ice off the streets. Snowplows can also be mounted on rail cars to clear railway tracks.

Snow Plow

In many cases, pickup trucks and tractors are outfitted with plows to fulfill this purpose. In areas…

A siren is a loud noise maker. The original version would yield sounds under water, suggesting a link with the sirens of Greek mythology. Most modern ones are civil defense or "air raid" sirens, tornado sirens, or the sirens on emergency service vehicles such as ambulances, police cars and fire trucks. There are two general types, pneumatic and electronic.

Noise Making Siren

A siren is a loud noise maker. The original version would yield sounds under water, suggesting a link…

This trolley wheel is used to hold heavy loading objects like furniture onto trolleys or hand trucks.

Furniture Caster

This trolley wheel is used to hold heavy loading objects like furniture onto trolleys or hand trucks.

A device for connecting railway cars or trucks together.

Rail Coupling

A device for connecting railway cars or trucks together.

Any of various large trucks that carry firemen and equipment to the site of a fire.

Fire Truck

Any of various large trucks that carry firemen and equipment to the site of a fire.

An image of a 'double truck'. This truck has everything that a single truck has (four equal size tires and a motor on each axis), but works in conjunction with a second truck to move the trolley. The trucks hold the trolley base and allow it to roll on the rails.

Double Truck

An image of a 'double truck'. This truck has everything that a single truck has (four equal size tires…