The Effect of the Number of Right-Turn and Left-Turn Lanes on the Performance of Undersaturated Signalized Intersections

Vehicle traffic flow channelizing can significantly contribute to fewer collisions and smooth in isolated signalized intersection design. Therefore, this study investigates the effect of changes number right-turn lanes with splitter islands left-turn storage bays for different volume approaches on performance. This aims provide an accurate analysis estimate such intersections, which improve Furthermore, delay parameter derived from HCM2016 simulation was evaluated scenarios. For purpose, performed using Synchro software. In study, a symmetrical, 90-degree, undersaturated (volume per capacity lower than 1, V/C < 1), four-leg were considered according AASHTO Green Book 2018 suggestions. results indicated less sensitive condition variation both single dual-lane bays. However, that not constant, depending volumes. On other hand, there significant difference parameters between dual HCM cases estimated 77.4% 59.7%, respectively. Overall, vision engineers modify geometry if or demand is larger through approach.