Nolo's Plain-English Law Dictionary

Negligence Per Se

Negligence due to the violation of a law meant to protect the public, such as a speed limit or building code. Unlike ordinary negligence, a plaintiff alleging negligence per se need not prove that a reasonable person should have acted differently -- the conduct is automatically considered negligent, and the focus of the suit will be over whether it proximately caused damage to the plaintiff.
NOLO-web2:DRU1.6.8.23.20160804.41205