Hello, in SUMO there is always a check to ensure that velocities are non-negative. This is not mentioned in the paper but can be understood when one looks at what this random speed reduction is meant to represent: a failure to drive with the maximum save velocity (driver imperfection) but not actually stepping on the brakes randomly.
regards, Jakob 2013/10/18 Massimo Sporchia <[email protected]>: > Hello, > I'm here to put a pretty much theoretical question about the vehicular > model SUMO is actually using (by what is written on the documentation site). > Simply put, correct me if I'm wrong, you have these 2 simple update rules: > v1 = min( v(t) + b , vmax , vsafe) > v0 = v1 - epsilon ( v1 - ( v(t) - b)) where epsilon = 0.4 (in the referred > paper). > > Now, v(t+1) is supposed to be a random number between v0 and v1 and here is > the question: > I've got two stopped car so close that vSafe is 0, which means that v1 > equals 0. > > If b is not equal to 0 (which is, by the way, the maximum breaking power), > v0 will be a number !=0 hence you'll see a car moving back and trying to > put himself in a correct position until v(t) equals b. > > Is it working as intended? > Am I getting something wrong? > > Sorry to bother you with these questions, tell me if this shouldn't be the > place to ask for these sort of questions. > > Massimo. > ------------------------------------------------------------------------------ > October Webinars: Code for Performance > Free Intel webinars can help you accelerate application performance. > Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from > the latest Intel processors and coprocessors. See abstracts and register > > http://pubads.g.doubleclick.net/gampad/clk?id=60135031&iu=/4140/ostg.clktrk > _______________________________________________ > sumo-user mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/sumo-user ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60135031&iu=/4140/ostg.clktrk _______________________________________________ sumo-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/sumo-user
