A: A semi-trailer is a truck trailer supported at the rear by its own wheels and at the front by a fifth wheel mounted to a tractor or dolly.

If you or someone you love has been involved in a Pennsylvania tractor trailer accident or some other large truck accident, you may want to get an estimate of the value of your case to ensure you're being treated fairly by the insurance company or you may want help investigating your semi-trailer accident case to ensure that responsibility for the accident is appropriately placed.  You may want to speak with an experienced northwest Pennsylvania truck accident lawyer .  Most Erie injury lawyers offer free consults so it shouldn't cost you anything just to speak with someone.