At some intersections, excessive queue lengths may spill out of the left-turn bay and block the through lanes, jeopardizing level of service for the entire intersection. One of the most effective plans recently presented by the researchers is the "Contraflow left-turn lane" (CLL) In this method, left-turn vehicles will use the nearest lane in the opposite direction in addition to the usual left...

Purpose This study aims to propose a centralized optimal control model for automated left-turn platoon at contraflow lane (CLL) intersections. Design/methodology/approach The lateral change and the longitudinal acceleration in horizon are optimized simultaneously with objective of maximizing traffic efficiency smoothness. proposed is cast into mixed-integer linear programming problem then solve...

The exit-lanes for a left-turn (EFL) is an unconventional method of organizing traffic left-turns at signalized intersections. In this paper, we propose nonlinear optimization model to minimize delay by establishing delay-time diagram the when non-oversaturated, considering relationship between pre-signal start node and queuing dissipation time vehicles. Model validation performed with example ...

As traffic volumes increase on major intersecting arterials, the transportation engineer’s challenge is one of optimizing through traffic while providing adequate opportunities for leftturning vehicles. Increasing traffic volumes not only provide a proportionately higher number of leftturning vehicles, but also make it more difficult to negotiate a left turn due to increased opposing traffic. T...

The decision making process in transportation is often about making a choice between alternative solutions to a problem. To select the best alternative, the decision should be based on results from a careful study of the implications of the alternatives. This paper presents the results of a study comparing two alternative interchange designsDiverging Diamond and Conventional Diamond Interchange...

arterial corridor greatly impacted by strip commercial development. The data-gathering efforts consisted of extensive traffic counts and travel-time and delay studies. This enabled us to see firsthand the great congestion that was occurring on the street. At the four most-congested intersections, unequal queuing between the two through traffic lanes was observed. In all cases, the right lane’s ...

Signalized intersections on high-volume arterials are often congested during peak hours, causing a decrease in through movement efficiency on the arterial. Much of the vehicle delay incurred at conventional intersections is caused by high left-turn demand. Unconventional intersection designs attempt to reduce intersection delay and travel time by rerouting left-turns away from the main intersec...

Describing routes is an easy everyday task for people who know the environment well. However, strategies exist also for situations where only incomplete knowledge is available. We present a study eliciting verbalized route plans and thinkaloud data from novices and experts who were asked to find and describe routes in a complex building. The spatial descriptions were analyzed relating the level...