3 ms·

I don't think it is particularly good design anyway.

• mjevans 10y ago
  It's a good design for 99% of the time and a very good design from a high speed traffic flow point of view. It requires minimal ramp up to crossing a feature that is nearly at the level of surrounding land. The correct engineering solution is to have diversity of designs, including an 'open top' bridge near by, which can serve the other cases as well as critical backup traffic during the failure. You might note that most of the preventative measures outlined do not modify the design of the bridge, but focus on actually keeping records that track the more critical /minimum/ clearance value, as well as more accurately detecting and reporting to the traveling 'over-sized' vehicle that an abort condition has been reached.