I'd be more concerned about bridges than parking garages. With a garage it's not unreasonable to weigh vehicles as they enter and stop permitting admissions whe

I'd be more concerned about bridges than parking garages. With a garage it's not unreasonable to weigh vehicles as they enter and stop permitting admissions when the total load has exceeded the weight. You activate your No Vacancy sign until someone leaves. Of course that means you need to weigh cars on their way out as well. There's not a solution like that for a bridge without seriously impacting traffic flow. Many of our bridges in the States have below a "C" rating. A couple have already collapsed, but that's still considered an irregularity. When can we expect them to start collapsing on a regular bases?