The differences are obvious. Outside the car it is very windy, making it very difficult to smoke. Took us a long time to cross as a result. Its a cool walk. It was kinda creepy under the bridge at the Marin side, shaky structure and loud truck noises. Towards the end of bridge hours (9PM) a police officer rode down the pedestrian path on a motorcycle,i. e. narrowly avoided doing the encounter with police task.