6.3.3. No part of the trailer shall move more than 0.5 m beyond the tangent to a circle with a radius of 25 m when towed by a vehicle leaving the circular path described in paragraph 6.3.2. along the tangent and travelling at a speed of 25 km/h. This requirement shall be met from the point the tangent meets the circle to a point 40 m along the tangent. After that point the trailer shall fulfil the condition specified in paragraph 6.3.1. a0c0