The Royal Automobile Club of Belgium and SRO Motorsports Group have announced the 24-hour of Spa race will remain on the Blancpain Endurance Series calendar until at least 2018.

The Blancpain Endurance Series calendar is expected to look largely similar for the next three years with only minor tweaks made. One of those changes is increasing the length of the Paul Ricard race to 1000km and for it to be held over the Saturday afternoon and evening.

The French round will remain the penultimate race before the blue riband 24-hour Spa race but will allow teams to have at least one full hour of racing in darkness, so they can test out cars and drivers ahead of the twice around the clock race.

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Other changes included higher safety standards being set, with younger drivers being made to take computer safety tests before racing.

In addition, a new full course yellow flag procedure is to be introduced which will force all cars to slow down to 80kph with overtaking strictly forbidden.