| 摘要 |
A sign system for roads includes a back sign. The back sign has a mount affixed to the ground that is adjacent to a road. A back sign device is affixed to the mount. The mount has a front face that is visible to oncoming traffic. The back sign device is located on a rear face visible to traffic that has passed the back sign, wherein a driver may observe the back sign device in a mirror mounted upon their vehicle after passing the back sign device and the back sign provides information to the driver. The sign system for roads may further include a broadcasting unit. The broadcasting unit may be in communication with a receiving unit being positioned in a vehicle and is adapted to communicate with the driver. When the driver of said vehicle approaches the back sign, the receiving unit can alert the driver of additional information.
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