Re: [sumo-user] regarding change of allowed speed along a route

[Jakob Erdmann <namdre.sumo@xxxxxxxxx>]

Hi Gerald,

exactly nothing happens along the way hence there is no documentation for this.

The speedFactor is picked at vehicle creation and remains constant over the life cycle. Being a unit-less value (typically ~1), it will be applied to every speed limit along the way when computing the maximum desired vehicle speed.

The only way to change vehicle attributes is via TraCI or type-calibrators.

A list of everything that can influence vehicle speed is at https://sumo.dlr.de/docs/Simulation/VehicleSpeed.htm

regards,

Jakob

PS: vehicle-class specific speed limits that were discussed in that email have since been implemented (and are strongly recommended when simulating a bimodal speed distribution for trucks and cars).

Am Mi., 11. Aug. 2021 um 18:10 Uhr schrieb Richter Gerald <Gerald.Richter@xxxxxxxxx>:

hi all,

to my understanding, when a vehicle enters the simulation stage,
it is randomly given a certain speed factor
that relates to the max allowed speed and
will lead to a desired velocity slightly below or above the lane limit.

what happens, when the allowed speed changes along the route?
I found this old communication:
https://sourceforge.net/p/sumo/mailman/message/27058304/

but would like to ask again.

• is the speed factor re-shuffled in such a case?
• are there any other cases where it is re-shuffled?

is there a rudimentary documentation (apart from the source code) 

which describes the life-cycle of a vehicle and what wondrous things might happen along the way?

thanks, best regards
Gerald.

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