Abstract
A typical at-grade transportation network forms a grid consisting of intersections. The majority of delays and accidents in the network are caused by traffic movements through those intersections. Even though the use of controlling systems gets rid of conflict movements at intersections, it increases the congestion due to capacity reduction. To overcome this important issue, designing zeroconflict transportation network is essential. A novel design of an at-grade transportation network without signalized intersections, roundabouts, or stop signs was proposed. It is called the Chet network, which can be used as an alternative form of urban streets for a built environment. Within the Chet network, a car can move from one place to another without facing any conflict movement at any junction while still maintain the low cost of at-grade infrastructure. The network is composed of hexagon blocks tiling together with a unique arrangement of one-way or two-way directional links to avoid conflict movements at all junctions. This study aims further to explore the concept of the Chet network by constructing several testing cases in microscopic traffic simulation to obtain the optimum block length in forming hexagons in the Chet network, which is an important step in moving forward to implementation in real-life.
Highlights
The topology of an urban street network is crucial in developing a city
There are some vehicles still in the network when the run ends in some testing cases; these vehicles were excluded from the average speed computation
50-m, 100-m and 200-m block lengths of Chet transport network being superior as it performs the lowest stopped time at low and medium demand levels according to Figure 6
Summary
The topology of an urban street network is crucial in developing a city. The grid network is the most widely used topology of urban street networks worldwide over the past centuries. As stated by Lewis Mumford, “Trend is not destiny” and he highlights that reviewing this long-lasting urban street and land use pattern to verify whether it is the most efficient topology yet is important. Even though a rectangular grid of urban streets is simple and incredibly easy to plan or build, it has many major disadvantages. It does not allow diagonal movements as stated by Prince A. It does not allow diagonal movements as stated by Prince A. [24]
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