Thomas Buck overtook two cars, including a friend's, before losing control and crashing into a ditch.
Yorkshire Water apologises, saying for some customers its support did not "go far enough".
Sinfield's ultramarathon challenge will end at Headingley Stadium, where he and Rob Burrow played.
The proposed North Yorkshire village, Maltkiln, would comprise thousands of homes and two schools.
A North Yorkshire Council report says the move for the Maltkiln site could be used as a last resort.
The teenage boy was travelling in a grey Peugeot when it crashed near Brimham Rocks, police say.
Land withdrawn from the scheme represents about half the planned development site.
Developers remain confident the 3,000-home plan between York and Harrogate will come to fruition.
Lee Mattocks is accused of setting up fake football club memberships to obtain tickets for games.
