First make sure that you have checked "Car Radar" in LFSLazy window (by default its off). If its checked see if any error in LFS chat come up.
Usually Car Radar fail to start when you are using some other program that creates overlay aswell, such as streaming/recording programs.
EDIT: Problem solved
Usually Car Radar fail to start when you are using some other program that creates overlay aswell, such as streaming/recording programs.
EDIT: Problem solved