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You mention width, which makes me realize something: there's no reason for a bus-lane AV service to stop everywhere. This means that cars should be able to pass at stops, which is possible when the road is as wide as bus lanes are. Bus lanes here are around 6.5-7.5m, and car lanes can be as slim as 2.2m, so bidirectional bus lanes now could be three-lane AV lanes in the future. Overhead clearance is a good point, although I think clearances are pretty well-standardized at 4m.