Nowadays, commuting by personal vehicles and public road transport is widely common and mostly cost-effective. In this regard, globally there is traffic congestion in megacities and inevitably road collisions take place, which leads to people’s injuries and a rise in traffic jams. Many governments are scrambling to decrease the number of accidents and are trying to introduce the latest technologies in the road infrastructure. It might be possible if these technologies are used correctly and reasonably. This paper proposes two blockchain-based accident detection models aiming at improving the ease of law violation detection and related measures. In particular, authors introduce a new technology, called offline-detection, relating to the detection of accidents in the absence of communication and Internet access. Blockchain technology itself may become a solution to improve honesty, openness, and truthfulness in cases of road-related issues. It allows restoring the road situation in details including location, vehicles, and surrounding infrastructure involvement due to blockchain property of immutability.