Ryder System, Miami, has signed a 1,500-unit contract with HighwayMaster Corp. for its mobile communications system. The units will be installed over the next two years, and HighwayMaster expects them to generate revenues in excess of $10 million, assuming they remain in service for their expected lifespan. For more information on the logistics and transportation solutions, visit the company’s website at http://www.highwaymaster.com.