Automated toll based collection system has helped a lot in reducing heavy congestion which has caused in front of the bridges of busy cities of the world. It is also the easiest method to control heavy flow of traffic. Digitally it captures the radio frequency by means of RFID technology. In this method a RF tag along with a unique code will be attached to the vehicle which emits RF signals. Every owner has to have an account with RFID tag attached to their vehicle. Whenever the vehicle reaches nearer to the entrance toll gate the signals will be detected and passed to the controlling device. If the vehicle owners are found with sufficient amount of balance in their account, only then they will be allowed to pass . Code Shoppy Again digital toll based collection system has also been found in developed countries like Canada which is known as Canada 407 Express toll route (ETR). In this system they introduced optical camera with Optical Character Recognition (OCR) which captures images and recognizes license plates without any tag. In Gujrat, a state of India there is electronic toll collection system using radio frequency and tag operates commercially on expressway where all needed equipment were supplied by Mitsubishi Heavy Industries . Again India has got its first interoperable RFID based electronic toll system in Ahmadabad- Mumbai National Highway which enables automobiles having electronic tags operates at frequency of (850-950 MHz) with distance up to 90 feet where response time is 10 milliseconds . This system can be considered as cost efficient but the driver has to get the receipt and pass through the gate. Furthermore, an institution named Active wave Inc. has come up with a system which monitors active tagged vehicles . These automobiles have active wave ranging 30 meters operating (916-917 MHz) for operation transmit and (433MHz) for receiving the link. Here, in form of blinking LEDS and beeping sounds the signals are observed. Moreover, the user interface has been designed using Microsoft .NET Framework. The tag uses car battery for power and two modules through RF modem transfer signals among themselves over the ISM frequency range of about (902-928) MHz. Another proposed model of digital toll collection has been developed in Poland which has got a combination of GSM and satellite based global positioning system . Here the system has got sensors and camera which captures and detects number plate. In addition, it captures the distance, evaluates the fees and rates transmitting them to the System Centre.
In our proposed model, we have built a suitable computerized Toll Collection System. The RFID implanted car number plate is allocated to the system. Our prototyped Digital Toll Plaza is made up with Arduino Mega, RFID reader, Display and servo motor for the Toll gate. We have used Arduino IDE programming language to run the system of our Toll plaza.
We manually implanted the RFID tag in the demo car for vehicle information. We had scanned each RFID tag before implemented the project to know about the unique ID and stored it into the database of our system. In our prototype, we only included the RFID number and balance information in database. When the project will be implemented, there will be detailed information about the vehicle like weight, Model and tracking system of the vehicle. In the proposed model, the vehicle passes through the toll plaza and RFID reader reads the information about the balance of the vehicle with the help of RFID tag. If the vehicle has sufficient balance in its account, the toll money has been deducted and balance has been updated in database. After scanning, LCD Display shows the RFID number and the text “Go forward”. Then, with the help of servo motor the toll gate opens for 4 seconds and it closes after that limited time. If an unfortunate occurrence happens that the vehicle does not have sufficient money in its account, the toll gate will not open and display shows “Access Denied, go left”. At left, there is a manual toll collection booth. The vehicle has to pay there and get updated the database with a warning to keep sufficient balance. Meanwhile, other car can pass the toll gate without making any traffic jam.
The proposed system can be used to develop a completely digital and smart toll collection system. In our country, manual toll plaza causes a lot of traffic. Besides, corruption in the toll plaza is an open secret. The proposed toll collection system can solve these problems efficiently. This RFID based toll collection system mainly depends on the RFID tags and RFID sensors. As most of the number plate of vehicles in Bangladesh has already been digitalized by government, Govt. can use the RFID tags of these number plates to detect the car and collect tolls without any need of stopping the vehicle. Information about the toll bill and account balances will be shared with the owners to ensure transparency in the toll collection. As a result, it will not only save the valuable time but also eliminate the corruption in the toll plaza. Moreover, in future, additional features such as over speed detection and prevention, overload indication and prevention in bridge, tracking vehicle which is stolen or involved in any accident etc. can be added in the system which will make the transportation system smarter and more secured. Thus, the proposed model can contribute to build a digital and smart road transportation system.