I have an idea to make the road safe and road signs interactive, by using a screen in the car with installing receiver device and installing transmitter device into road signs which will transfer the data from the sign to the car's screen to inform the driver by the data in the sign as alarm or even warning. Also, we can include the speed limit when the sign said the speed limit is 100 km/h so the fuel actuater will decrease the amount of fuel then the speed will be reduced to the limited speed as in the sign.
-Power supply to the road signs (may install solar cell)
-Transmitter device to be installed on road sign
-Screen in the car
-Receiver in the car
-Speed limit controlling on the car.