I guess there is a reason for that - it is way harder for suicidal people to jump of it.
One can commit suicide and create a traffic jam at the same time. It would be like a two-for.
Yeah, someone will have to remove the parked car from the bridge, but, you know the car belongs to the finance company anyway so who really cares.
I wish there was a pedestrian path on all bridges. I suspect that they did not add one because of the expense.
I am not sure why it's not there. I still think it's because of safety issues.
But I do wish I could walk across... or cycle.