The beautiful view from the Cooper River bridge is enough to make you forget just how fast you’re going. Thankfully, a 55-miles-per-hour speed limit and a healthy amount of traffic can usually keep a driver out of trouble. But it’s a jarring shift to 40 mph before you’re hardly over the bridge’s expanse — and Mt. Pleasant police know it. Officers sit just off the exit ramp, radar guns locked on where the speed changes and ready to hand over expensive tickets. Consider yourself warned.