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  [TLSI] Road is a continuous flow of traffic. It would make little impact on the entire flow of traffic by altering the mechanism of one intersection. On the contrary, it would only create a traffic jam in the next intersection.
 


The diagram illustrates a TLSI connected with conventional at-grade intersections on all four sides.

Where do the cars approaching the at-grade intersection A on the north come from? It is the sum of the cars entering from the at-grade intersection on the east to make right turns at the TLSI, cars entering and going straight through the TLSI from the at-grade intersection on the south, and cars entering from the at-grade intersection on the west to make left turns at the TLSI.
In this case, if a traffic jam is created in the area A near the intersection on the north, is it caused by the TLSI in the middle of the diagram or is it because there are too many cars coming into the at-grade intersection A?

If the TLSI in the middle were a at-grade intersection, and traffic jam spreads, could the traffic jam in the area A in the intersection on the north be resolved? Or, would it cause traffic jam at all intersections on east, west, north and south?

Handling more traffic on the TLSI does not create additional traffic that would not have existed in the TLSI.

As you have mentioned, road is a continuous flow of traffic, and one intersection is connected to four sides and have effect on other sides.
If a bottleneck is created at an intersection downstream from the TLSI, then it is because the design of the road cannot handle the traffic, rather than because of the TLSI.

If the TLSI in the diagram is a conventional at-grade intersection and becomes the bottleneck, then it would only increase the time it takes to get through the intersections.

In conclusion, the TLSI would improve the traffic flow as much as it is constructed.
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