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 <[email protected]>: > 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 > ------------------------------ > *发件人:* [email protected] <[email protected]> 代表 > Jakob Erdmann <[email protected]> > *发送时间:* 2020年12月8日 19:43 > *收件人:* Sumo project User discussions <[email protected]> > *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 <[email protected]>: > > > 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 > > _______________________________________________ > sumo-user mailing list > [email protected] > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user > > _______________________________________________ > sumo-user mailing list > [email protected] > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user >
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