namdre
commented
6 months ago The strategic distance, isn't really tied to an urban or motorway setting but rather to the number of intersections within the lookahead window (the comments only document the design intention). Furthermore, the values of 3000 and 200 only set the maximum lookahead distance. Depending on the current speed of the vehicle and the density of surrounding traffic, the strategic lookahead distance can be much shorter. This makes it somewhat difficult to document the behavior without giving a lot of code details. I'm interested in exploring the issue of unsuitable defaults though. Do you have a nice example that shows how the lane changing comes to early?
W.r.t weaving on short edges, see https://sumo.dlr.de/docs/Simulation/Motorways.html#combined_on-off-ramps
ambuehll
Quick question about lcstrategic in the lane changing model LC2013: It would be helpful if the formula and the max distances for the factor lcstrategic were in the documentation. There are some old mailing list threads (https://www.eclipse.org/lists/sumo-user/msg13147.html) that talk about 3000m and in the src code I found there to be two values: 3000m for highway and 200m for "urban".
I have the issue that many vehicles select their lane very early in an urban setting with an lcstrategic of 1; setting it to 0.01 yields better results. In addition, there are some gridlocks happening for weaving vehicles on short edges (i think this is a known issue) - I'll see what I can do about that.
Any documentation would be appreciated. As always, many thanks!