Here's one, probably for the locals.
Scenario: You're travelling a short distance - for example - within one area of Zone 1 to another area of Zone 1 - or maybe from Zone 1 just to within the border of Zone 2. You have your tube route mapped out in your mind. Perhaps it involves a transfer to a second line to get to your destination. Just as you're about to go into the tube, a bus stops outside on the road, and it's also going to your destination.
a) decide to hop on the bus instead?
b) continue below to the tube?
The reason I ask, is because, the few times I DID take buses in London, they were remarkably fast on short trips and extremely direct. They seem to travel very specific routes that are very convenient for people. So if you're familiar with the bus system, what would you do, as a local?
I'm not necessarily talking about a regular trip you take - I.e. If you go to work and back home, you probably know the best mode of transport for your route already. I'm talking about one-off, specific journeys.
Dunno about y'all, but I actually found street traffic not to be that bad in London! It was busy, but it moved, I don't recall seeing any "jams" per se.