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Originally Posted by imp_squared

you are an idiot!! It is not how fast you can go on the road. It is the amount of time and distance needed to stop your car going at 80km/h!!

Stopping distances for cars - Road Safety Authority Rules of the Road

name calling - mature

and you have just proven my point - given that there are no intersections on the bridge, and with everyone going at approx 80km/h, you're just hunky dory - if you're on a road with pedestrians, intersections, etc. you would need to stop quickly (hence a lower speed limit), on a completely straight road with no possibility of interaction with anything other than the traffic in front of you would warrant a higher speed limit