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在田径运动的径赛项目中,有些是不分道进行比赛的,如1500米、3000米、3000米障碍、5000米、10000米等。这些项目的起跑线和抢道标志线,都是一条弧线。按《田径规则》精神,为使每个运动员所跑初段距离力求相等,则画直道上的弧形起跑线时,通常是以第三直曲段分界线离开内突沿0.3米处一点为园心,分别以70米、100米和85.96米为半径,向后由里道向外道所画的弧线,即为3000米障碍、1500米起跑线和抢道标志线。画弯道上的弧形起跑线时,通常是以第三或第一直曲段分界线离开内突沿0.3米,向前量30米弧长取其一点为园心,以30米弧长为半径,由里道向外道画渐开弧线,此渐开弧即为3000米、5000米,10000米和800米（不分跑道）的起跑线。
In track and field events, some of them do not partake in competitions, such as 1500 meters, 3000 meters, 3000 meters obstacles, 5000 meters, 10000 meters and so on. The starting line of these projects and the road markings are all a curve. According to the spirit of the “track and field rules”, in order to make every athlete run the first distance from the beginning to strive for equal, then draw straight on the arc starting line, it is usually the third straight segment of the line of demarcation from the internal protrusion along the 0.3 m at the center , Respectively, with the radius of 70 meters, 100 meters and 85.96 meters respectively, and the arc drawn backwards by the inner and outer road, that is, the 3000-meter barrier, the starting line of 1,500 meters and the lane mark of the road for grabbing. When drawing the curved starting line on the curve, it usually takes the third or first straight curved section boundary to leave the internal protrusion along 0.3 meters, the forward 30 meters arc to take one point as the center of the circle, and the arc length of 30 meters as the radius , From the inside out of the road drooping arc, this involute arc is 3000 meters, 5000 meters, 10000 meters and 800 meters (regardless of the runway) starting line.