I'm saying there's pros and cons to the finer details of how it works. It's not good of it's setting itself off at false alarms. I haven't a clue in the technicalities but if the system involves a device which emits a beam and activates the alarm of the beam is broken by an object. Maybe the solution would be to pitch the beam lower to ignore overhead signs etc.
Clearly safety comes before comfort but it must be startling for passengers who hear the 'Warning Low Bridge' message when in reality there's no danger.
Maybe we should just revert to tin cans on rope 100yds before a bridge?
