Correct answer
Speed, grip, braking, visibility and surrounding conditions.
Consider especially speed, grip and braking conditions, together with visibility and surroundings. Rain, tyres, load and brake condition can change the required margin. Also observe traffic and other vehicles’ characteristics: a safe gap is not determined solely by counting vehicles or by a fixed category of the vehicle ahead. Observe any applicable specific minimum gaps as well.
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Speed, grip, braking, visibility and surrounding conditions.
Only the number of vehicles present, disregarding speed and braking.
Only the category of the vehicle ahead, with a fixed gap in every condition.
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