A road-to-vehicle communication system capable of avoiding an increase in the size of each of vehicle-mounted apparatuses and easily confirming the contents of data stored in each vehicle-mounted apparatus on the on-road apparatus side when the transfer of information therebetween by radio communications...http://www.google.com/patents/US5962833?utm_source=gb-gplus-sharePatent US5962833 - Vehicle-mounted apparatus for road-to-vehicle communications and road-to-vehicle communication system
