I have a speculation about why the north ramp of the Chitty Chatty bridge has an extra lane.
That north ramp is very steep. Bicyclists who want to cross the bridge will have to gear down and go slow to make it up. Might the extra lane be for "slow moving vehicles" ? At the top of the ramp bicyclists would merge with the golf carts.
The south ramp is much longer and less steep. No need for the "slow moving vehicle" lane.
Of course that leaves the question of where pedestrians should walk.
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