#1 purchase for bike owners traveling near cars: Garmin Varia. Cheaper ones exist, but this one a) pulses at drivers to let them know you exist and b) informs

#1 purchase for bike owners traveling near cars: Garmin Varia. Cheaper ones exist, but this one a) pulses at drivers to let them know you exist and b) informs you on your head unit that car(s) exist(s). It's not a panacea but it'll turn a bad situation (inattentive driver) into a better one.