Internet of things technology enables all the physical devices to be connected through the network and exchange data among themselves over the internet. Road accidents are the most dangerous things to happen to a road user especially due to over-speeding. One of the possible ways of controlling speed to prevent accidents is by applying the applications of IoT. The objective of Automatic Vehicle Speed Control is to develop a system that automatically controls the speed of the vehicles at specific areas such as school zones, hospital zones, speed limited areas, etc. Encoders are mounted at the zones which continually transmit codes that are different in different zones. When the vehicle reaches the zone, the decoder present in the vehicle decodes the data transmitted by the encoder and sends the decoded data to the programmed micro-controller which in turn is responsible for decreasing the speed of the vehicle and keeping vehicle speed constant until it moves out of the zone. Later on, the vehicle can regain its original speed. Apart from speed detection this system also has an inbuilt object detector unit (with 555 IC, TSOP 1738, IR) i.e the vehicle comes to halt when it detects any object in front. Thereby avoiding most of the accidents. Automatic Vehicle Speed Control also consists of a unit (with LDR) that automatically illuminates the street lights in the absence of light.