Bicycles pre-date cars, so were on the roads ahead of cars. So the rules were written such that bikes have the same access to roads as cars. Bike access to roads is important to general commerce in the US, in some places people bike to work and provide services, think of a crowded city for example. The bike in the left lane is legal. Probably they were preparing for a 3/4 turn around a roundabout which is legally done from the left lane. Golf carts came after cars, when safety was a bigger concern in society, so the rule makers decided that unprotected carts could only be on roads with low speed limits to limit the damage of an accident and the speed difference between cars and carts would be less. These rules (and the multimodal paths, tunnels and bridges here) allow for cart access to (nearly?) everywhere in the Villages.
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