@jwz @docpop @foon My interpretation of the Valencia center-running bike lanes is that it solved one issue - drivers parking in the bike lane - and made a bunch of other things worse, such as illegal turns across the bike lane.
This is actually a general theme in all fields of engineering. How many times have you seen some folks go "Email sucks because of this one thing. I will make an email replacement which fixes that one thing!" and makes a bunch of other things worse. Over and over.