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| 511 - A free phone service that provides real-time traffic and travel information 24 hours a day, seven days a week. Works on all cell phones and land-line phones. |
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| Accident Investigation Sites - Designated areas away from the travel lanes to be used for temporary parking of damaged vehicles, filling out forms after an accident has occurred, emergency repair of disabled vehicles, issuing citations, etc. The purpose of these areas is to reduce “rubbernecking” and to provide a safe refuge for persons investigating an accident. |
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| Arterial - A major highway primarily used for through traffic and usually on a continuous route; it serves major traffic movements while providing access to abutting land. |
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| Acceleration Lane - A speed-change lane, including tapered areas, for the purpose of enabling a vehicle entering the roadway to increase its speed to a rate of which it can more safely merge into traffic. |
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| Average Daily Traffic (ADT) - The average 24-hour volume at a given location over a defined time period less than one year. |
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| Annual Average Daily Traffic (AADT) - The average 24 hour volume at a given location over a full 365 day year. |
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| Average Annual Weekday Traffic (AAWT) - The average 24-hour volume occurring on weekdays over a 365 day year. |
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| Barrier Walls - Concrete walls used in the median or between two adjacent roadways in order to prevent vehicles from crossing into oncoming traffic and to redirect errant vehicles. |
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| Bicycle Lane or Bike Lane - A portion of a roadway that has been designated by striping, signing and pavement markings for preferential or exclusive use of bicycles. |
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| Capacity - The maximum hourly rate at which persons or vehicles can be reasonably expected to traverse a point or a uniform section of a lane or roadway during a given time period under prevailing roadway, traffic, and control conditions. |
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| Changeable Message Sign - Electronic sign capable of displaying any message as programmed by the operator to inform motorists of any situation which would cause traffic delays or necessitate the use of an alternate route. |
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| Collector Distributor Road - A limited access road adjacent to an interstate and similar to a frontage road which collects traffic from the interstate and distributes it to various roads with exits located along that interstate. It also collects the traffic wishing to enter the interstate from the various roads along the interstate and distributes it onto the main line of the interstate at a single point. |
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| The Clean Air Campaign - The Clean Air Campaign is a non-profit organization that works to reduce traffic congestion and improve air quality through a variety of voluntary programs and services. It serves as a clearinghouse for a multitude of organizations that have programs in place to address traffic congestion and air pollution. |
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| Daily Vehicle Miles Traveled (DVMT) - A daily average of the amount of vehicle miles traveled (VMT) on Georgia’s public roads. |
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| District - A management region defined by the Georgia DOT; the Department’s seven district offices throughout the state provide localized services. |
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| Deceleration Lane - A speed-change lane which enables a vehicle exiting from a roadway to slow to the safe turning speed of the intersection or driveway it is approaching. |
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| Environmental Protection Agency (EPA) - A federal agency charged with protecting the natural resources of the nation. |
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| First Responder - The company or unit who is expected to reach the scene of an incident first. |
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| Flashing Beacon - Overhead flasher which is installed in an area where a traffic signal is not warranted but where some warning of a hazardous condition is needed. A yellow flashing beacon indicates the use of caution and a red flashing beacon serves as a stop sign. |
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| Freeway - An expressway with full access control. |
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