Atimes crossing the river niger bridge in Onitsha gets me trembling. Heavy truck are always moving on it. There was a time it cracked, however, it has being fixed.
In my suggestion, such bridges should have people monitoring the force exerted on the bridge by various vehicles.so that they would stop other vehicles form approaching when the maximum tensile strength of the bridge/structure has being reached by the due to the loads(vehicles)
RE: Understanding the Effects of Forces in Structures and Microstructures #2