The Doctor's moped

The Doctor's Moped was a small, blue Vespa motor-scooter that the Tenth Doctor kept in the Tardis, along with appropriate helmets.

The Doctor and Rose Tyler rode on the moped when they thought they arrived at New York in 1956 to see Elvis Presley perform. Although they found themselves in London in 1953 instead, their clothes and the moped did not look out of place. The Doctor later gave he keys to his scooter to Tommy Connolly, who helped him defeat The Wire. He told Tommy to wait until he's old enough to drive.(DW: The Idiot's Lantern)