Districts that installed cameras on bus stop arms saw a sharp drop in drivers passing a stopped bus. The programs also produced a revenue stream that several school boards say they did not plan for.
The signal system on the busiest line dates from the 1930s. Replacing it means closing sections every weekend for three years — and the first year is running four months behind.
Two dozen state transportation departments now fly camera drones under bridge decks instead of sending crews on ropes. Inspections are faster and safer — and there are more bridges due for one than ever.
