1. Automation and Efficiency in Toll Collection Systems

In toll gate systems, there is growing interest in automation, driven by the need to optimize efficiency and reduce waiting times. Rajan Senapati, B., et al.^[18] highlight the potential of leveraging Vehicular Ad-hoc Networks (VANETs) to achieve these objectives. They emphasize the challenges in manual toll collection systems, particularly with increasing vehicle numbers. By comparing proposed automated systems with conventional protocols like Geographic Source Routing (GSR) and Anchor-based Street Traffic Aware Routing (A-STAR), they underscore the benefits in terms of reduced delays and improved service times, setting the stage for further experimentation in real-world VANET environments.
Dhilipkumar, S., et al.^[7] highlight the significant traffic congestion and economic losses at toll booths on India's national highways. They identify inefficiencies in manual toll collection, such as delays, change issues, and human errors. To address these challenges, they propose a smart toll collection system using ZIGBEE and RFID technologies. This system enables automated toll collection, eliminating the need for vehicles to stop, reducing fuel consumption, enhancing road safety, and improving the overall travel experience. By harnessing wireless transceivers and cloud-local hybrid databases, this system aims to modernize toll collection and alleviate highway congestion.
Further underscoring the trend toward automation, Naaz, S., et al.^[14] emphasize the development of AI-based toll collection systems. They note the increasing demand for automation to address congestion and inefficiency in traditional toll collection methods. By utilizing RFID technology for the electronic transmission of data in real-time, these systems aim to replace paper-based ticketing with convenient, reusable RFID tags. The proposed system seeks full automation, transparency, and convenience, with potential applications extending beyond toll collection, such as railway ticketing. While not all benefits may be universally realized, the deployment of Electronic Toll Collection (ETC) technologies holds significant promise for reducing congestion and enhancing overall transportation efficiency.

2. Technology Utilization for Toll Collection

Recent research has introduced innovative approaches to revolutionize toll collection, addressing inefficiencies and congestion in traditional manual systems. Haque, M. A., et al.^[9] present an Automated Toll Plaza System (ATPS) in Bangladesh, utilizing RFID and GSM modules to deduct toll charges directly from vehicle owners' DBBL rocket accounts. Controlled by a microcontroller-based database module, the system swiftly identifies vehicles via RFID tags and deducts toll charges upon verification, demonstrating promising results in reducing entry time and enhancing efficiency.
In parallel, Randriamasy, M., et al.^[17] highlight the emergence of Intelligent Transportation Systems (ITS) and Cooperative ITS (C-ITS) applications, particularly in electronic toll collection (ETC). By leveraging ITS-G5 technology and advanced filtering techniques like Kalman Filtering, they aim to ensure accurate geolocation and secure communication channels during toll transactions. These advancements signal progress towards seamless tolling processes within connected vehicle environments, offering benefits for both drivers and service providers.
Additionally, Balamurugan, K., et al.^[4] propose an Automatic Check Post and E-Toll Payment System to address traffic issues and delays at toll plazas. Using RFID and GSM modules for toll payment and vehicle monitoring, combined with image processing technology, this system aims to enable faster, more secure toll collection. By providing multiple payment options and incorporating vehicle theft detection features, it seeks to streamline toll collection, reduce congestion, and enhance overall efficiency at toll plazas. These research endeavors collectively mark the beginning of a new era of technology-driven solutions set to transform toll collection operations worldwide.

3. Challenges and Solutions in Toll Collection

The global interest in optimizing toll collection systems, especially in developing nations like India and Indonesia, highlights the critical need for efficient infrastructure development. Shahrier, M., et al.^[20] and Dismantoro, D., et al.^[8] both address the challenges of manual toll collection, such as long queues and traffic congestion, emphasizing the need for technological solutions. Al‐Mahmud et al. emphasize the potential of GPS-based solutions to streamline toll collection, while Dismantoro et al. focus on GPS-based mobile applications to expedite toll payments and reduce congestion on urban roads and tollways.
In response to these challenges, Suresh, A. C., et al.^[23] and Punitha, A., et al.^[16] advocate for the adoption of advanced technologies like RFID, IoT, and real-time payment systems to automate toll collection. Suresh et al. focus on India’s road transportation system, where manual toll collection contributes to traffic congestion and economic losses. Their proposed Online Toll Payment System aims to eliminate the need for vehicles to stop at toll plazas by utilizing RFID and IoT for seamless, automatic toll transactions. Similarly, Punitha et al. highlight the perception of toll gates as hindrances due to financial burdens and delays. They propose toll gate payment systems that streamline the payment process, reduce congestion, and provide real-time account information to enhance convenience for both workers and drivers.
Collectively, these studies reflect a consensus on the need for technological advancements to address the challenges of manual toll collection and traffic congestion. By leveraging GPS, RFID, and IoT, these proposed solutions offer promising opportunities to improve transportation infrastructure, enhance user experience, and ensure fair, efficient toll collection processes across toll plazas globally.

4. Smart Solutions for Toll Collection

The surge in traffic congestion, particularly at toll collection points, due to outdated manual toll collection processes, has spurred a wave of innovative solutions. Christopher, K. K., et al. [6] highlight the inefficiencies of manual toll collection, which wastes fuel, causes traffic jams, and inconveniences the public. Their proposed smart toll automation systems, leveraging RFID technology and mobile applications, offer faster and more efficient toll payment processes. By automating toll collection and integrating with mobile platforms, these systems significantly improve traffic flow, reduce fuel consumption, and mitigate air pollution, presenting a promising solution for modernizing toll management.
Similarly, Hidayat, R.^[10] focus on enhancing the E-toll Card system at Suramadu Toll Gate. Through comprehensive evaluation using the Critical Incident Technique (CIT) and Importance Performance Analysis (IPA), they identify key areas for improvement to address transactional issues and traffic congestion.
Recommendations include increasing the number of toll gates with an open-close system and conducting awareness campaigns to streamline toll road services and enhance the user experience.
Furthermore, Chandrappa, S., et al.^[5] present an IoT-based Automotive and Intelligent Toll Gate system, revolutionizing toll collection through RFID technology. By assigning unique RFID cards to vehicles and leveraging Raspberry Pi technology, this system automates toll collection, reduces traffic congestion, and enhances security. RFID technology enables vehicle tracking and automatic toll collection, significantly improving road safety and environmental sustainability.
Collectively, these innovative solutions aim to streamline toll payments, alleviate congestion, and enhance the overall efficiency of transportation systems.

5. Technological Innovations in Toll Collection

Technological innovations in toll collection systems are driving significant advancements in efficiency and automation. Alliance, S., et al.^[3] highlight the growing importance of time efficiency in toll collection, leading to the adoption of NFC technology. NFC's simplicity enables contactless payment applications, facilitating paperless and automated toll processing. By utilizing NFC-based smart cards and active tags, toll collection systems are becoming more streamlined, offering enhanced user experiences and providing intelligent alternatives to traditional methods. Similarly, Sathya, G., et al.^[19] introduce license plate recognition technology to further automate toll collection. Using CCTV cameras and pressure sensors, vehicles approaching toll booths trigger image capture and processing to identify vehicle owners linked to a central database. This method eliminates the need for manual payments, significantly enhancing efficiency and reducing congestion. The system's potential extends beyond toll collection, with applications in traffic surveillance and parking fee collection, emphasizing its effectiveness in automating toll processes and notifying owners of toll deductions. Collectively, these innovations signal a shift towards streamlined, automated toll collection systems aimed at improving overall efficiency and user satisfaction.
Problem Prevailing
Traditional toll gate payment systems face limitations in scalability, efficiency, and user experience due to reliance on hardware infrastructure. This study aims to address these challenges by proposing the integration of GPS technology into mobile-based toll gate systems. The problem statement focuses on enhancing the effectiveness and adaptability of toll gate payment systems to meet the evolving needs of the transportation sector. By leveraging GPS technology within mobile platforms, the study seeks to optimize user experience, streamline operations, and reduce costs for toll authorities, ultimately advocating for a transformative solution in toll collection.

The Figure 2 illustrates a block diagram of an RFID-based toll collection system, which differs from a GPS-based system. Although the survey focuses on GPS-based toll systems, RFID remains a prevalent technology in electronic toll collection. Here’s a breakdown of how the RFID-based system operates:

• Vehicle: A vehicle with an RFID card or tag affixed to it approaches a toll booth.
• RFID Scanner: As the vehicle passes the scanner, it transmits the RFID tag’s unique identifier.
• Database: The scanner transmits the ID to a database storing account information linked to each RFID tag.
• Account: The database retrieves the linked account and checks the balance.
• Toll Deduction: If sufficient funds are available, the required toll amount is deducted from the account balance.
• Gate Access: The gate opens to allow the vehicle to pass.
• Admin/User System: This system allows administrators to monitor and manage the toll collection process, including updating toll rates and managing user accounts.

An RFID-based toll collection system uses short-range communication between the reader and the vehicle's tag, limiting tracking capabilities over long distances. In contrast, GPS-based systems use GPS technology to track vehicles, enabling flexible tolling options like pay-per-mile schemes.
Actual Comparison
The Table 1 compares various methods for vehicle identification and toll collection systems, evaluating the challenges and shortcomings of each approach. The assessment covers systems that combine technologies such as RFID (Radio Frequency Identification), load cells, IR (Infrared) sensors, ultrasonic sensors, GSM (Global System for Mobile Communications), and near-field communication. Each system’s effectiveness, design clarity, potential congestion issues, viability, security, and applicability in specific contexts have been examined. The systems assessed include those using RFID with load cells for classification^[13], RFID and IR sensors^[24], RFID and ultrasonic sensors facing classification challenges and viability issues with the pay-later method^[1], RFID with unique tag IDs lacking displayed results^[15], an integrated system with pollution measurement and cost calculation, but congestion concerns related to its near-field communication system^[12], and systems using RFID with weight measurement^[2][22]. Additionally, systems combining RFID with GSM and featuring prototype testing have been evaluated, with one gateless toll system deemed inapplicable in Zimbabwe^[21]. Other systems integrating RFID and GSM for automatic deduction lacked vehicle presence detection and effective user-system communication^[10]. Furthermore, a system integrating sensors for vehicle presence, RFID for identification, and IR sensors for accident detection revealed inconsistencies in microcontroller usage and lacked conclusive results^[11]. This analysis provides insights into the strengths, weaknesses, and suitability of different vehicle identification and toll collection systems, supporting informed decision-making for more efficient and reliable toll infrastructure.