Although the audience dipped over the course of the first episode, from 8.1 million to 6.8 million, 'Collision's performance stood out amid strong competition from the other terrestrial channels.
This included Channel 4's controversial one-off drama, 'The Execution of Gary Glitter', in which the convicted paedophile faces the hangman in a fictional Britain where the death penalty has been reintroduced.
The programme's audience grew towards the end of its 9pm-10.35pm slot, giving it an average audience of 1.2 million, with another 225,000 watching on Channel 4+1.
'Flash Forward' on Five pulled in 2.3 million viewers, taking a 9.3% share of viewing compared to Channel 4' s 5.5%.
However, ITV1 dominated with a 30.3% share, far ahead of nearest rival BBC One, which managed a 17.5% share with nature series 'Life'.
The fifth of ten parts of the David Attenborough voiced documentary looked at birds, attracting 4.3 million viewers.
BBC Two equalled Channel 4's performance with 'University Challenge'-based film 'Starter for Ten', gathering 1.2 million viewers and a 5.4% share in the 9pm-10.30pm slot.
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