Inspecting the engine possibly means collecting data from the engine ECU. It may have logged truck behavior at the time of accident. Accelerator pedal position, engine speed, road speed, torque, faults, brake pedal position. Commercial vehicles collect data.
I volunteer on a citizen advisory panel for local bike/ped infrastructure. We have lots of plans, prioritized by impact, considering safety and cost. Our current funding levels and mechanisms will get the critical safety items done in, I don't know, maybe 100 years. Priority goes to projects that increase motor vehicle throughout, by orders of magnitude.