Just 7.8% of the slot's audience tuned in to see the documentary, which collected people's experiences of driving in London over one week last summer.
All the other main channels managed above three million, with BBC One's 'Survivors' in front with 3.7 million viewers and a 14.4% share.
Channel 4's maternity ward documentary, 'One Born Every Minute', continues in strong form with an audience of 3.6 million viewers including its Channel 4+1 ratings.
Five attracted 3.2 million viewers, earning a 12.6% share of viewing, with 'CSI', ahead of BBC Two's three million-strong audience for its Winter Olympics coverage.
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