TEMPE, AZ--(Marketwired - January 28, 2015) - American Traffic Solutions (ATS) has added another partner to its school bus stop arm enforcement portfolio.�In addition to its current integration with AngelTrax, ATS and Radio Engineering Industries (REI) will now work together to offer a school bus stop arm camera enforcement solution. CrossingGuard�, ATS' school bus stop arm running solution has proven to be extremely effective at reducing the number of vehicles that illegally pass stopped school buses.