I am writing to seek your assistance in resolving an issue related to the car-to-vehicle distance in VISSIM when there are multiple lanes. I have encountered a phenomenon where autonomous vehicles (AV) deviate from the spacing when driving alongside human-driving vehicles (HDV) in the side lane.
To provide some context, I have set the car-to-vehicle distance between AV and HDV by configuring the parameters CC0 and CC1 in the Car-following tab of VISSIM. All vehicles have been assigned a speed of 100 km/h, and there is no variability in the speed distribution.
In my experiments, I have observed that when there is only one lane on a highway without a traffic signal, all vehicles maintain the set interval and drive at the same interval (Input demand is far greater than the capacity of the highway. Furthermore, when AV and HDV are mixed, the distance between cars remains consistent with the spacing. The passing traffic volume, as measured by the detector, aligns with the capacity calculated based on the theoretically set car-to-vehicle distance. Thus, the results match the expected behavior as per the theory.
However, the issue arises when there are two lanes. In this scenario, some of the AV drive with wider spacing than the set spacing, specifically when HDV drives alongside them in the side lane.
I am seeking guidance on how to address this issue. I have already configured CC0 and CC1 in the Car-following settings. Therefore, I think the Car-following settings have nothing to do with the problem. If there are any additional parameters or settings that I should consider adjusting to resolve this problem, I would greatly appreciate your advice.
Please provide me with more details and insights on how to address this issue effectively. Your expertise and guidance would be of immense help in resolving this matter.
Thank you for your attention to this inquiry. I look forward to your prompt response and assistance.
Deviation in AV's spacing with multiple lanes in VISSIM can occur due to differences in the construction of the simulation model and the real-world environment. Differences in lane geometries, additional traffic flows, merging and diverging flows, and lane changes can all introduce variations in the speed and acceleration of vehicles, leading to differences in the spacing of AVs in the simulation compared to those in actual scenarios.
Thank you for your reply. I see your comment.
Can I remove all of these variations in VISSIM? Should I use com-interface?
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