Imagine you have a collection of 5,000 bus posters dating from as far back as 1913 — how do you choose just 15 of the best for an exhibition? It's enough to need an army of conductors.
This is the task facing the London Transport Museum as the Year of the Bus draws to a close. It's planning an exhibition of the best of its expansive collection, and needs your help to decide which ones make the cut.
Museum staff are asking people to pick their favourites from a selection of 30, by going to their Facebook page and liking the ones they think should be included. The ones with the most likes will be included in the display, which opens in November.
We've picked our preferred posters in the gallery above, including one which explains that you can save the price of a drink by buying a Weekly Bus Pass, and some beautiful pre-Second World War illustrations. You can see the full selection on Facebook, where you can vote for your choices.