Passenger Mirror Won't adjust in Exterior, Body, Chassis & Paint Posted March 31, 2016 They are pretty useless. When mine was my daily, I'd look at it as changing lanes. If something started to appear I'd just hold straight for awhile. The offender would usually pass or make room. When driving at night, I just looked for their headlight reflecting off the right dash pad. If it was lit up, I knew a car was in my blind spot.