Road heating systems are used to keep the roads open in winter in the cold and snowy regions of Japan by heating the road surfaces and melting the snow on the road. Road heating systems do not impede traffic and are especially demanded at road sections that are prone to accidents in winter, such as crossings, and in cities where the traffic volume is large. However, such systems are expensive to construct and operate and are costlier than mechanical snow removal. To reduce the total cost of road heating systems, we propose the use of urban waste heat and urban-type heat accumulators. The running cost of road heating systems can be reduced by utilizing the heat that is now wasted. Heat accumulators stabilize the supply of urban waste heat, the production of which is unstable, and make road heating systems smaller and more useful. We then compared a conventional system and a system that heats the road using sewage heat and stores heat in an accumulator. Since underground heat accumulators are now expensive, our estimation showed that the new system was approximately 10 per cent more expensive than the conventional system in total cost. We will develop methods for manufacturing inexpensive heat accumulators and efficiently utilizing non-utilized urban heat sources to reduce the cost of the new system to the level of the conventional systems.