Bit line size of Sichuan fire truck

The line size is 4m*6m. The width of the outer frame line is 20cm, the width of the inner grid line is 10cm, the included angle between the inner grid line and the outer frame line is 45 degrees, and the words "No fire lane occupation" are marked at the center of the sign line along the driving direction, and the line size is 4m*6m (the specific size is subject to the width of the fire escape, generally not less than 4m, and the length is 6 to 10m).