Dear SUMO gurus, I am currently experimenting with the latest ACC car following model in the SUMO dev version (v0_32_0+2173-2227d6e0a4) I have installed and I have noticed a large number of vehicles experiencing Emergency Braking. I am mixing vehicles with the default CFM and the ACC CFM and only the ACC vehicles are experiencing this issue. It seems as if it is happening mainly at traffic lights. Observation via GUI tells us that the vehicle is reaching the emergency deceleration threshold as approaches the yellow light signal at the intersection.
I understand that this ACC CFM is under development but was interested in learning why this increase in emergency braking is happening. Is it because the model just hasn't been tested in urban environments with traffic lights? How does it handle switching the ACC mode off, and letting the human model take over in busy urban environments? To attempt to understand this, I bumped into Surrogate Safety Measures. I tried: 1. Adding the ssm device via vTypeDistribution file by using: device="ssm", then deviceName="ssm" and then hasDevice="ssm" and none of them added the param to the routes file after running randomTrips.py 2. I tried adding "<param key="has.ssm.device" value="true"/>" to the routes file inside the vType to attempt to make all vehicles of the same type have the ssm device and I got an Error: Could not build output file 'ssm_706.xml' (Too many open files). Quitting (on error). 3. I tried adding "<param key="has.ssm.device" value="true"/>" to the routes file inside only one select vehicle and I got this error: Sumo-gui.exe has stopped working. A problem caused the program to stop working correctly. Please close the program. And the same happens with the sumo.exe in command line. Clearly I am doing it all wrong. Would you be kind to shed some light on the process of using the ssm device? If you have any info about the ACC CFM and the emergency braking phenomenon as vehicles approach traffic signals would be great also. Thanks, Hector
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