wants to expand the NYPD unit that investigates crashes. In the wake of a city council hearing last week to determine the fate of the NYPD’s Collision Investigation Squad — which the council wants to transfer to the Department of Transportation and then expand — Mayor de Blasio on Wednesday announced that he supports only the expansion part, a policy his own NYPD denounced two years ago and again last week. How we preciently covered last week’s hearing. “We need to do more to investigate crashes because we need more consequence for crashes,” the mayor said on Wednesday. “So, yes, we should expand that capacity.”