In a
car accident case — especially in cases where an insurance company is disputing liability (or fault)-- lay witnesses can
testify about the speeds and directions of vehicles, temperature and weather conditions at the scene, traffic conditions at the scene, lane markings, visibility conditions, observations made at the scene, statements that were made by either the plaintiff or the defendant at the scene, and the presence (or absence) of traffic control devices at the scene, such as traffic lights or stop signs.