Motorbike
Motorbikes were a form of ground transport, typically able to carry one or two riders. They were common on Earth in the 20th and 21st centuries.
The Monk's TARDIS briefly took the form of a motorbike when the First Doctor reprogrammed its chameleon circuit, ultimately changing its outer form to that of a police box. (DW: The Daleks' Master Plan)
A number of UNIT troops used motorbikes. (DW: The Ambassadors of Death)
Captain Mike Yates used a motorbike to follow the Third Doctor and Jo Grant in Bessie when they were chased by Tom Girton in the UNIT helicopter in an attempt to drive them into Azal's heat barrier, which was surrounding Devil's End. To show Sergeant Osgood what was needed to penetrate the heat barrier, the Doctor used a felt-tipped pen to draw a circuit diagram on the motorbike's windscreen. The Doctor then used the motorbike to ride back to the village, as Yates had taken the injured Jo back to The Cloven Hoof in Bessie, but was shot at by Bert and forced to continue on foot. (DW: The Dæmons)
Billy had a motorbike called the Vincent, which had a passenger sidecar. The Seventh Doctor drove it for some time during his encounter with the Bannermen. (DW: Delta and the Bannermen)
In Perivale, the Seventh Doctor faced Midge, who was infected with the Cheetah Virus, in a duel which involved the use of motorbikes. (DW: Survival)
In 1999, the Eighth Doctor and Grace Holloway stole a motorbike from a policeman in San Francisco while trying to get to the Institute for Technological Advancement and Research. That same day, another policeman rode his motorbike (with faulty brakes) through the open doors of the TARDIS, immediately turned around, and sped off in the opposite direction. (DW: Doctor Who)
Blaidd Drwg (Bad Wolf) was a motorbike gang. (TM: Jetsam)
Sarah Jane Smith used her sonic lipstick on a motorbike. It sparked and disorientated the rider. (SJA: The Lost Boy)
Rory Williams and Amy Pond pursued their daughter Melody on a motorbike in 1939 Berlin. To do the same, the Teselecta was able to change its shape into a human riding a motorbike. (DW: Let's Kill Hitler)
