Last night, I was the designated driver, and me and my friends wound up out in down town Bethesda past Metro's closing time. So I drove my one buddy back to Rosslyn. At his request, I took Old Georgetown Road to the Beltway, then the GW Parkway to the US50 exit to get to his place.
On a whim, I decided to take the Key Bridge to M St and then Wisconsin Avenue back towards Bethesda to see how much longer it would have been. Now mind you, this was 3 a.m., but it took 8 minutes less to shoot up Wisconsin, and that's including a stop for gas.
Just thought it was interesting.