Speaking to MPs, Shadow Transport Secretary Maria Eagle said this afternoon, "Surely, the answer is not to delay decisions on HS2 but to speed them up on aviation?"
Transport Secretary Patrick McLoughlin responded said it was right to ensure the aviation policy was set before committing to relevant decisions on HS2.
He told MPs: "But from day one, HS2 will provide far faster journeys than now via a major new interchange at Old Oak Common, linking to the Great Western Mainline, Crossrail and the Heathrow Express."
Responding directly to Ms Eagle, Mr McLoughlin added: "But it is right to see what the Davies Commission (on aviation) says."
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Surrey Police are appealing for witnesses after the driver was seriously injured in the crash in the early hours of Saturday.
The Duchess of Cambridge has been driven to St Mary's Hospital in London in the "early stages of labour", Kensington Palace has said.
The 20-year-old was found fatally wounded on Roth Walk, near Finsbury Park, north London at around 3am on Saturday, Scotland Yard said.