| 摘要 |
A drawing system for composing a digital aerial photograph is provided to make a traffic flow smooth by preventing a collision with a road structure in advance. A first post(111) of the pillar part(110) is installed at a gate of the highway structures (T). The second post(112) of the pillar part comprises an extension bar(112a) to a road direction. A first sensor(120) is installed on the extension bar and senses a vehicle approaching, and then it outputs a vehicle approaching signal. A second sensor(130) sense a vehicle which is not allowed to pass and an alarm signal since a road structure is not high enough to pass the vehicle. |
