Would it be difficult to use the modern radar/lidar sensors being used in cars for automated cruise control to trigger some electrical engineering in the bus?

It detects the height and incoming argument and does the red light/lift off the gas/brace siren. It could all be placed in a little bulge in the front grill and wired up easily.

Sounds like a job for a small business and some IPR, spot me 5% if you do it. You might even get sponsorship from National Rail.

Everyone loves a Morgan. Even me, unless it's broken again.