Hello, discretization errors arise due to the combination of - a continuous formula for computing stopping distance, - the discrete position update formula currently in use by sumo (see http://sumo-sim.org/trac.wsgi/ticket/860) There was a potential for overlapping vehicle trajectories when both the ego vehicle and the leader vehicle had different maximum deceleration values (something, that was not allowed for in the original Krauss dissertation). The value of 0.5 was not computed but rather obtained by looking at plots of different vehicle trajectories. Note, that the code for computing safe speed has undergone refactoring and now no longer includes this term. regards, Jakob
2014-08-18 7:04 GMT+02:00 wideyes <[email protected]>: > The term (+ 0.5) gives an upper bound for the follower stopping distance > to handle discretization errors. > g + (v^2 - a*v)/(2*a) = x*t + (x^2 - b*x)/(2*b) + 0.5 > how to get 0.5 value？ what‘s the meaning of discretization errors？ > > ------------------------------------------------------------------------------ > _______________________________________________ > sumo-user mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/sumo-user > ------------------------------------------------------------------------------ _______________________________________________ sumo-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/sumo-user
