Bike Anti-Porn - When Things Go Wrong

Practicality. Even at the front of the dropout there's space for a bus to drive through.

But closing that gap too far may actually be wrong:
http://www.lookcycle.com/en/us/look-cycle/technologies/techno-aero.html

Current thinking is that a bit of spcae is good.

All sound like proper reasons but I still say...