Traffic Management

A jersey barrier is a concrete barrier that acts as a traffic control device to separate traffic flow. The name was derived from New Jersey, where they were first used.

The entry point or access ramp allowing drivers on a freeway general purpose lanes to move onto a managed lane (HOV, HO/T, Express Lane).

In an effort to ease traffic density, some metropolitan areas or states implemented HOV lanes or constructed HOV roadways. These stretches of highway are generally restricted in use to vehicles with two or more passengers. In most locales, these restrictions only apply during the peak hours of traffic. However in some cities, the HOV restriction is in place 24 hours. Variable message signs indicate the restriction times and changes. Interstate [...]

Short for the words "hazardous materials", hazmat related signs usually pertain to truck restrictions through tunnels or a heavily populated area where a hazmat related accident or spill would be detrimental to the immediate surroundings. Shields are in place now for hazmat preferred routes and banned routes. The signage is a white square with the letters HC in a green circle. When this logo is surrounded with a red circle [...]

Also known as carpool lanes, high occupancy vehicle (HOV) lanes are lanes reserved for vehicles with two or more occupants. Usually, the HOV Lane is the far left lane, and concrete barriers, plastic pylons, painted medians or other forms of access control may separate the HOV Lane from the main lanes.

A vertically orientated four-head signal where the bottom lens flashes with a yellow arrow, indicating that turning traffic may proceed with caution. This type of signal generally replaces "dog house " traffic lights where green and yellow arrow lens are orientated next to green and yellow ball lens. It permits left-hand turns after yields made for opposing traffic and pedestrians.

The exit ramp or departure point where motorists may leave a managed lane or reversible roadway. Egress Points are used when lane changes are otherwise prohibited between the general purpose lanes and HOV or tolled express lanes.

An electronic sign with a changeable board displaying travel conditions, travel times or highway safety message along a highway. See also Variable Message Sign.