Network Rail is to reopen the level crossing in Barns Green in West Sussex on on Monday 26 March following a fatal accident last month.
Two members of the same family were killed when a train collided with a car.
A 15-year-old boy and a 72-year-old man were travelling in the car when the collision happened.
The crossing, on Emms Lane, has been closed since the crash on 17 February to enable the Rail Accident Investigation Branch and the Office of Rail and Road to carry out their investigations, and to allow engineers to repair and replace crossing equipment.
The new equipment will be switched on and the road reopened on Thursday.
Leanne Ward, level crossings manager for Network Rail in the South East, said: “On behalf of the Network Rail team, I’d like to thank people in Barns Green for their support and understanding over recent weeks. We know the level crossing is an important transport link and I’m pleased to confirm our work there is almost complete.”