Hi all,
first of all, thanks again for the helpful reply to my previous question – sorry to bother with a new one 😉
I’m in the calibration process of a motorway section. The network contains a fork where a three-lane roadway splits into two two-lane roadways. Through traffic must merge left at this fork.
Currently, I am using a step length of 0.1s with action step length of 1.0s. I am observing many stuck vehicles not able to perform the necessary lane change in time. For now, I am using the default car following and lane changing parameters (except for the speed acceptance, which follows a normal distribution for a passenger car and a truck type).
While I had few problems with failed lane changes with a simulation step of 1s, the severity of congestion due to stuck vehicles seems to increase as I reduce the step length (leaving action step length the same).
I have a few questions on this issue:
- Default value for SUMOs time-to-teleport.highways option
The doc states that when teleporting, highways are distinguished from other roads if its speed limit is > 69 m/s = ca. 250 km/h. Is it possible that this distinction was meant to be made at ca. 70 km/h instead? Is this wrong in the doc? Because if I use the following configuration, vehicles are removed quickly even with edge speed limits lower than 69m/s:
<time-to-teleport.highways>0.1</time-to-teleport.highways>
<time-to-teleport>300.0</time-to-teleport>
- What does the –time-to-teleport.highways default value of zero mean?
When I do not specify a value for –time-to-teleport.highways, i.e. with default value zero, I still see vehicles getting stuck and waiting. In contrast to a –time-to-teleport value of 0, teleporting doesn’t seem to be disabled at all, but it seems to match the –time to teleport value. Is that correct?
- Influence of simulation step length on teleporting and/or Lane Changing?
Is the teleporting and/or the lane changing behavior in any way influenced by the simulation step (given that action step length remains fixed)? As said, with a simulation step of 1.0s, failed lane changing is by far less frequent - I see only a few speed drops, but no stopping vehicles. All LC params, as well as tau and the other CF params, are at their default values in both cases.
Thanks for a reply!
Kind regards
Jan