The other day we saw two No. 1 buses following each other closely in Knoll Road. What’s more, we’ve seen this happen before. Thinking about it, the bus in front will generally collect all the waiting passengers at a bus stop, so it may have to spend some time there. The bus behind it might have no-one to pick up or drop off, and will have no real need to stop. So why don’t buses catch each other up more often?