If riding on a double-length cross-town bus, walking to the back to sit is preferable. Most of these busses stop in the middle of the block due to the length. So a 7th Avenue stop is between 6th and 7th. If 7th Avenue corner is where you are heading, then you are closer to there on a long bus, if you exit from the final rear door. A small triumph but if in a hurry…. well, if in a hurry, one probably wouldn’t be taking the bus.