I was thinking of following solutions:
1- Install 2-3 pen laser lights in bumpers, the line of laser light will be visible to some distance, if there is some vehicle/truck/wall ahead it will hit and a spot will be visible, driver can get an idea that some thing is ahead stopped
2- Install some ultra sonic sensors in front, they will scan say 10-20 feet, when there will be some thing ahead, it will just beep and beep intensity will increase as distance decreases
3- Something like thermal camera, a view on car dash panel, heat from next vehicle can be detected with thermal cameras, but dividers will not be visible in it.