Just during normal car maintanence or after a blow-up. The right lower frame rail usually contains the front brake line and the fire bottle cable as those have to be shielded where they pass the clutch can/motor plate. I some cases,by the rules, all wiring must be exposed , even with that, trouble shooting a wiring/air line issue is a lot easier without running them inside the frame. Most builds run them thru tunnels in the motorplate uprites