Re: [sumo-user] Impact of junction shape on simulation

[Jakob Erdmann <namdre.sumo@xxxxxxxxx>]

For "clean" junction shapes there are some impacts (most of them small)

- larger junctions require more time to pass and thereby reduce flow (larger safety gaps, larger required all-red / clearance time between traffic light phases)

- larger junctions provide more place for unprotected left-turning vehicles to wait which may increase left-turn flow at traffic light junctions

- smaller junctions increase road space which may reduce the chance of jamming / deadlock

The impact of these shape effects is small when compared to the effects of missing lanes or wrongly defined lane-to-lane connections.

If a junction shape is "not clean" (i.e. looks broken) then the algorithm which computes right-of-way may fail and this can be a major problem.

Am Di., 26. Apr. 2022 um 03:54 Uhr schrieb yu tang <herrtangvonjj@xxxxxxxxx>:

Hi all,

I found it is hard to edit junctions in NedEdit so that the shapes match road geometry in real life, meanwhile I think it can be solved by manually defining the shapes in the corresponding xml file.

Suppose other conditions keep unchanged and only junction shapes are refined, does it have any potential influence on simulation accuracy? Or do we have better solutions to addressing junction shapes?



Best,
Yu
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