A 25-year-old, arrested on suspicion of causing death by dangerous driving after a crash on the M1 yesterday, has been released on police bail.
Two people died and six people were injured in the accident, near Watford, yesterday.
Hertfordshire Police say the man, from east London, has been bailed pending further enquiries.
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Before the final declaration on Friday, the Conservative candidate looked set to lose the City Hall race to Labour's Sadiq Khan.
The Tooting MP has been the frontrunner in the counting process ahead of Tory challenger Zac Goldsmith.
It's not just London where elections have been taking place today. There were council elections taking place across the home counties.