Some invisible lines in CARLA maps

[wujingda]

Hi all, Recently I tried to use the "lane_invasion" sensor to detect the crossing lane behaviors of the ego vehicle. When crossing different types of lanes, the sensor will give the name of the lane crossed. Specifically, when crossing the curb line, the sensor will give the feedback signal of "NONE", which indicates the vehicle crossing the lane type called "NONE". Based on this principle, I could detect it when the ego vehicle crosses the curb line. However, in the official CARLA maps, the "NONE" signal occurs not only in crossing curb lines, but also in crossing some dashed white lines or dashed yellow lines. In this context, I cannot perfectly detect curb-line-crossing behaviors. Could somebody give insights on how to merely detect the curb line crossing behavior?

Carla Version: 0.9.13 Platform: Win10