Gun New Zealand driver Brendon Hartley is expecting a few scary moments in this weekend's Le Mans 24-hour endurance race.

Sixty two cars in three different categories will start the race and with different driving abilities and slower cars scattered around the 13.6 kilometre circuit, Hartley says collisions are top of mind at every turn.

A three-time winner in eleven starts in the world-famous race, Hartley drove his Toyota Hybrid to the fastest time in practice.

Earl Bamber is the other Kiwi in the Hypercar line-up.

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