To improve the quality of mobility and transportation in a smart city, Electronic Toll Collection (ETC) system has been widely implemented along toll roads, which can automatically collect the usage fee from vehicles. There are many advantages of using ETC systems, such as no need to prepare cash, no need to waste time waiting in a queue, and be able to improve the air quality at tollgate. However, there are still some challenges remained for existing ETC systems, in relation to data storage, trustworthiness and transparency. To address this issue, there is a need for building a unified, decentralized, and trusted data storing platform. Motivated by this demand, in this work, we introduce a blockchain-based ETC system called EdgeTC. Unlike most other blockchain-based ETC platforms that use PoW or PoS, our system uses PBFT to achieve relatively faster performance. In the evaluation, we compare the system performance between Ethereum-based and Hyperledger-based ETC. The results indicate that Ethereum-based system suffers efficiency problems when the chain becomes long, while Hyperledger-based ETC can maintain a stable time consumption during the transactions.

为了提高智能城市的出行和运输质量，沿收费公路广泛采用了电子收费系统（ETC），该系统可以自动从车辆收取使用费。使用ETC系统有很多优点，例如，无需准备现金，无需浪费时间在排队等候，可以改善收费站的空气质量。但是，在数据存储，可信赖性和透明性方面，现有ETC系统仍然存在一些挑战。为了解决此问题，需要构建统一的，分散的且受信任的数据存储平台。受此需求的驱使，在这项工作中，我们介绍了一种基于区块链的ETC系统，称为EdgeTC。与大多数其他使用PoW或PoS的基于区块链的ETC平台不同，我们的系统使用PBFT来实现相对较快的性能。在评估中，我们比较了基于以太坊和基于Hyperledger的ETC的系统性能。结果表明，基于Ethereum的系统在链条变长时会遇到效率问题，而基于Hyperledger的ETC可以在交易过程中保持稳定的时间消耗。