You can start off with warning signs. I doubt bridges would collapse if pedestrians or bicyclists use them but sings could fend traffic off. Second, the size o

You can start off with warning signs. I doubt bridges would collapse if pedestrians or bicyclists use them but sings could fend traffic off. Second, the size of the vehicle is important. Larger vehicles like trucks get these poor bridges lifespan shortened drastically. Trucks and busses could be rerouted on safe bridges and so on. I generally am not afraid of bridges because they have convinced me that they're safe but if a bridge were to collapse under me and I'd make it out alive I'd probably have a bridge phobia.