Abstract
A staggered intersection is a special type of intersection in a road network. Its geographical characteristics consist of two T-legged intersections that cause the lost time per cycle to become longer than at cross intersections under conventional signal control, thus leading to low intersection efficiency. This article shows that the problem can be eliminated at the left–right type of staggered intersection by channelization and signal phasing, based on a sorting strategy and pre-signal, which reduce the amount of lost time during the signal cycle using the split distance as the sorting area. VISSIM was used to model and analyze the proposed method as well as the conventional method for comparison purposes. The simulation revealed that the proposed method reduced the average delays and maximum queue lengths in each movement and for the entire intersection, both in the peak hours and in the off-peak hour.
Highlights
A staggered intersection is a special type of intersection in a road network
Two traffic flows can be discerned in the staggered intersection: one is the traffic flow on the main road, whose traffic volume is higher, and the other is that on the minor road, which is crossing the main flow of traffic
This research has presented a signal control design for the LR type of staggered intersection, including intersection channelization and signal phasing based on a sorting area and pre-signal
Summary
A staggered intersection is a special type of intersection in a road network. A staggered intersection should not be confused with a split intersection The latter splits a major intersection into two sub-intersections by dividing the major road into two separate roadways just before the crossroads, forming two smaller intersections with the crossroads, each sub-intersection having the geometry of a cross-shaped (four-legged) intersection.[2]. Much of the existing literature on staggered intersections focuses on their safety and performance when there is no signal control. Mahalel et al analyzed the safety and operational characteristics of two types of staggered intersections in comparison with those of a four-legged cross intersection without signal control. The results showed that the non-signal-controlled staggered intersection, especially the RL type, has advantages in delays, number of stops, and capacities.
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