Cellular motorist assistance phone number center for the Chicago Metropolitan area. Cellular calls to *999 are free of charge with underwriting provided by cellular service providers. Calls are redirected to a central location and information is passed to appropriate authorities. Mostly used to report traffic situations or travelers in need of assi [..]

Indicates a partial closure of an entrance ramp. Traffic is still able to pass. See also Entrance Ramp.

Indicates a partial closure of an exit ramp. Traffic is still able to pass. See also Exit Ramp.

Regional systems aimed at optimizing traffic flow for a set of roads or the entire region. Elements typically include sensors to monitor traffic flow, centrally programmable traffic signals, automated highway signs, computers and telecommunications technology.

System which provides travelers with information designed to help them plan routes. This information can be web-based traffic information, broadcast traffic reports, in-car computerized maps and dynamic message signs.

Informal name for the National Railroad Passenger Corporation created by the federal government to operate the nation's intercity passenger rail services.

See Advanced Traveler Information System.

See Advanced Traffic Management System.

A traffic barrier designed to compress under impact.

An Advanced Traffic Management System operated to manage traffic on the Borman Expressway (I-80/I-94) in Northwest Indiana.