168.1(2)If an authorized emergency vehicle equipped with at least one lighted lamp exhibiting a flashing red light visible from the front of the vehicle or a service vehicle exhibiting a revolving or flashing amber light visible from the front of the vehicle is stopped on a highway, the driver of a vehicle travelling on the same side of the highway shall reduce the vehicle’s speed to one-half of the posted maximum speed limit and shall proceed with caution, having due regard for traffic on the highway, the condition of the highway and the weather conditions, to ensure that the driver does not collide with the authorized emergency vehicle or service vehicle or endanger any person outside of the authorized emergency vehicle or service vehicle.