Re: [sumo-user] Calculating time-to-collision

[Jakob Erdmann <namdre.sumo@xxxxxxxxx>]

In my tests, minTTC and self-computed ttc are consistent. You can get an example here: https://sumo.dlr.de/extractTest.php?path=complex/traci/vehicle/ssm/basic

Note, that minTTC will also provide values for encounters at intersections. This cannot currently be computed with the getLeader function because it does not return intersection-conflict vehicles.

If you still cannot get your TTC computation to work, please provide a minimum example (ideally by modifying the linked example).

‪Am Sa., 14. Mai 2022 um 04:39 Uhr schrieb ‫محمد ألأسدي‬‎ <mr.1997.mc@xxxxxxxxx>:‬

Easy to fix

في الجمعة، ١٣ مايو ٢٠٢٢ ٣:٤٣ ص Mariam Wessam Hassan Mohamed Nour <mariam.nour@xxxxxxxxxxxxxxx> كتب:

Hi all,

 

I’m trying to calculate time to collision at every time step for each vehicle in sumo.

 

I’m getting the spacing between each two vehicles as well as the speed of the leader using the getLeader function. Then I use the equation ((spacing+minGap)/difference in speed) to get ttc.

The gap calculation was based on this (https://github.com/eclipse/sumo/issues/10178)

 

On the other hand, every vehicle is equipped with an SSM device to calculate ttc. So I’m also able to directly get ttc values for each vehicle using traci.vehicle.getParameter(veh, "device.ssm.minTTC"). However, this ttc value and the one I calculate above don’t match.

 

Am I calculating ttc using wrong values in the first approach? If not, then what could be the problem?

 

Thanks

Mariam

 

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