As is the case with many accidents involving semi-trucks, there are not only local laws but state and federal ones as well that need to be known and navigated. An experienced lawyer will help you to maneuver within this unfamiliar terrain; they stay up-to-date with changes in the laws in their practice areas and geographic locations. Beyond that, an attorney can help you collect evidence and find credible witnesses to back your claim as to the cause and result of your accident.