摘要: |
Auxiliary Lanes (ALs)are used on frontage roads to help facilitate safe weaving, merging, and diverging traffic movements to and from the frontage roads at and between freeway ramp terminals. They help balance the traffic load and provide transitions, vehicle storage, acceleration / deceleration to and from driveways, turnaround lanes, and interchange approaches and departures. Acceleration and deceleration lanes, climbing lanes, and right-and left-turn lanes are examples of AL types that can serve different purposes. There is limited guidance For designing ALs on frontage road sat and between freeway ramp terminals. The goal of this project is to identify gaps in existing guidelines and develop design criteria for ALs on frontage roads. To address this goal the research team will: a) review the literature and the state of practice in Texas; b) determine the conditions under which a certain type of AL design improves traffic operations; and c) conduct safety analyses to identify influential factors and develop crash prediction models that practitioners can use to determine how the addition of an AL with certain characteristics can affect safety. |