*A Stop-arm mounts on the left side of school bus with crossing arm extending like bow list.

*Stop sign deploys on the side of bus by vertical-align, the tolerance is ±5º;

*The top side should be horizontal to the bottom of the passenger window. And the distance limits max 150mm. Keep the stop arm on vertical points to ensure viewing by driver.

*Extending distance max 610mm from bus facing.

*Closing distance max 160mm from backward.

B.2.1 Stop sign color, shape, letters, pictures making according to national law. Outside octagon diameter 500mm or 450mm, white side is 20mm and surface without sharp corner.

B.2.2 Two sides of board facing should be the same with 3M reflective sheet.

B.2.3 Clutch moment 50N to stop sign outer during turning, the sign need to follow.

B.2.4 If stop-arm broken down or lose control, replace it by handle.

B.3 Operation Standard

B.3.1 Bus drivers operate the stop arm extend or pull back by hand or foot. The control switch or points set to ensure the driver can be touch. During the crossing arm extend, he can be alarm.

B.3.2 If the bus starting engine the stop arm not pull back, bus speed over 5 km/h, it can close automatically.

Why Need Stop-Arm on School Bus?

Every school day begins and ends with a trip on a school bus. Careful as we are, school bus incidents still occurred every year when children get on and off the bus. Therefore, it is important for every school bus to install a bus stop arm with flashing warning led light, which is easy to catch the attention of other coming drivers