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I have occasionally commented on the disappointment that comes when an arriving bus has a full bike rack. Some fit two bikes, others three, but once full, that's it; no bikes on the bus. More likely in the summer but can happen anytime.
Solution #1: Just wait 30 minutes for the next bus. Only once has the following bus also been full, meaning an hour wait. If the weather's okay, and I have a smart phone or computer (e.g., my new Air), I'm okay. But if the day has been long or frustrating, the wait seems interminable.
#2: Lock up my bike at the bus stop, and then pick it up in the morning. After two stolen bikes from the bus stop, scratch this option.
#3: A folding bike, that can be taken on board, in a bag no bigger than common carry-on luggage. So I've started the process of googling and test-riding that may end up with a folding bike in the garage and at my foot on the bus.