Right-turn lanes provide space for the deceleration and storage of right-turn vehicles, and separate turning vehicles from through movements. Dual right-turn lanes are increasingly used at urban intersections primarily for two reasons: (1) to accommodate high right-turn demands and avoid turn-pocket overflows, and/or (2) to prevent right-turn vehicles that exit from a nearby upstream freeway off-ramp (on the left of the roadway) from abruptly changing too many lanes toward the right-turn lane at the intersection. In addition, a number of other factors may affect the decisions on the installation of dual right-turn lanes. However, warrants for dual right lane installation are almost non-existent, leaving traffic engineers to rely on engineering judgment. This research aims to develop warrants for installation of dual right-turn lanes at signalized intersections. Both the operational and safety benefits/costs were analyzed by surveying traffic engineers and by conducting traffic simulation-based analysis. Microscopic traffic simulation model, VISSIM, was used to quantify the operation benefits and Surrogate Safety Assessment Model (SSAM) developed by Siemens was used to analyze the safety gains due to installation of dual right-turn lanes.(Fitzpatrick and Schneider, 2004). The addition of an exclusive right-tum ... Highway Desigp Manual, 2003. Cooner A. S. et al., Development of ... Indiana Design Manual, Part 5, aRoad Designa Chapter 46: Intersections At-Grade. Available atanbsp;...
|Title||:||Development of Warrants for Installation of Dual Right-turn Lanes at Signalized Intersections|
|Author||:||Yi Qi, Xiaoming Chen (Ph. D.), Da Li|