"Bus ride" joke

A blonde is visiting Washington, DC. This is her first time to the city, so she wants to see the Capitol building. Unfortunately, she can't find it, so she asks a police officer for directions.

'Excuse me, officer,' the blonde says,' how do I get to the Capitol building?'

The officer says,' Wait here at this bus stop for the number 54 bus. It'll take you right there.'

The blonde thanks the officer and he drives off. Three hours later the police officer comes back to the same area, and, sure enough, the blonde is still waiting at the same bus stop.

The officer gets out of his car and says,' Excuse me, but to get to the Capitol building, I said to wait here for the number 54 bus. That was three hours ago. Why are you still waiting?'

The blonde says,' Don't worry, officer, it won't be long now. The 45th bus just went by!'