TRB's Commercial Truck and Bus Safety Synthesis Program (CTBSSP) Synthesis 3: Highway/Heavy Vehicle Interaction reports on the safety interactions of commercial trucks and buses with highway features and on highway improvements that can be made to improve the safety of heavy vehicle operations. A copy of this report can be found at https://onlinepubs.trb.org/Onlinepubs/ctbssp/ctbssp_syn_3.pdf.