| 摘要 |
<p>A support frame 1 is mounted on a vehicle and driven by operating mechanism 2 from a control panel within the vehicle. It can be swung away (and retracted) from the vehicle to display a sign in the highway lane. An extension arm 4 15 of light weight material and is adjustable in the support frame tube 5 by matching securing devices 6. The sign 7 attached to the extension arm is of light weight material, reflective and aerodynamically profiled to withstand wind gusts.</p> |
