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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