I was involved in an motor vehicle collision

Collision occurred in a merging lane with a tractor trailer on the interstate i76 West bound. No safe spot on i76 shoulder because it was too narrow. Tractor trailer was behind me a few cars back and i assumed would follow me to the exit of route 1 North. I pulled into the shoulder and waited. Other truck did not show up and at this point i called my employer and they told me they would give further instructions. I did not personally call the police because I assumed my work did since it was their vehicle. The Pennsylvania state police are now involved. I need advice.