Yes, victims of car accidents caused by driving on the wrong side of the road may sue the at-fault motorist (defendant) for negligence per se. Should the case go to trial, the victim (plaintiff) would need to prove that: The defendant violated a traffic law (by going against traffic); the purpose of this traffic law was to safeguard people like the plaintiff (other drivers); the plaintiff's injuries were caused by the defendant's violation; and the injuries resulted in money damages. Most cases never reach trial. Instead, the plaintiff's Colorado personal injury lawyer would try to negotiate a settlement out of court. The goal would be to recover sufficient compensatory damages to pay for all of the plaintiff's injuries, which includes not only medical bills but also any lost wages and pain and suffering.