Re: [sumo-user] 回复: start-up lost time

[Jakob Erdmann <namdre.sumo@xxxxxxxxx>]

Using extra 'u' time or extra 'r' time is the same.

However, setActionStepLength differs because it takes effect for the whole simulation and in any kind of situation after being set.

Am Fr., 11. Dez. 2020 um 04:28 Uhr schrieb q kevin <kevinqkl@xxxxxxxxxxx>:

Hello,

In order to simulate the start-up lost time in sumo, I think the mechanism and effect of using"u", using extral red time and using traci.vehicle.setactionsteplength are the same. Am I right?

Best reagrds,

Kevin

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From: sumo-user-bounces@xxxxxxxxxxx <sumo-user-bounces@xxxxxxxxxxx> on behalf of Jakob Erdmann <namdre.sumo@xxxxxxxxx>
Sent: Wednesday, December 9, 2020 4:58:21 PM
To: Sumo project User discussions <sumo-user@xxxxxxxxxxx>
Subject: Re: [sumo-user] 回复: start-up lost time

 

Hello,

'u' encodes 'upcoming green'. In the real world this can often be found as 'red+amber' lights.  In the simulation it is shown as orange. Vehicles treat this like a red phase. The main use of 'u' over 'r' is to make the program easier to interpret by the human viewer.

regards,

Jakob

Am Mi., 9. Dez. 2020 um 08:45 Uhr schrieb q kevin <kevinqkl@xxxxxxxxxxx>:

Hello Jakob，

I read the description of 'u' on sumo's website(traffic signal light), but I didn't understand what its actual role was. Because I saw in the post https://github.com/eclipse/sumo/issues/7832 that someone uses 'u' to simulate the start-up lost time of a vehicle when traffic signal light changes from red to green  , I want to know what its role is.

Would you please explain?

Best regards,

Kevin

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发件人: sumo-user-bounces@xxxxxxxxxxx <sumo-user-bounces@xxxxxxxxxxx> 代表 Jakob Erdmann <namdre.sumo@xxxxxxxxx>
发送时间: 2020年12月8日 19:43
收件人: Sumo project User discussions <sumo-user@xxxxxxxxxxx>
主题: Re: [sumo-user] start-up lost time

 

Yes. The headways measured at the stop line decrease from ~3.5s to ~2s over the first 4 vehicles.

The effect is fairly robust relative to simulation step length and action step length and depends strongly on the desired vehicle acceleration and of course desired headways (tau).

However, there is currently no way to calibrate this independently for startup and general car-following.

For a discussion and implementation plan, see https://github.com/eclipse/sumo/issues/7832

regards,

Jakob

Am Di., 8. Dez. 2020 um 05:54 Uhr schrieb 邱 开来 <kevinqkl@xxxxxxxxxxx>:

Dear everyone,

I want to know if the vehicle start at the intersection is the same as the real situation shown in the figure,when the signal light changes from red to green? If not， how to achieve this effect

Thank you!

Best Regards,

Kevin

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