"Free" is really handy for keeping the service fast & on time though. Not required to be sure, but each rider digging for change takes time. My local bus rapid

"Free" is really handy for keeping the service fast & on time though. Not required to be sure, but each rider digging for change takes time. My local bus rapid transit is nominally not-free, but tickets are not checked. It's impressive how fast it is, and that is part of why.