Ok one go here http://www.garmin.com/products/sp340/ THE 340 DOES have OPTIONAL traffic alerts, BUT youy ahve to buy the antenna, unlike the 550 and nuvi 660 that have the antenna ALREADY built in. If you get a unit that you HAVE to buy the antenna service is free for 15 months, if you get a 550 or a 660 with it built in service is free for 3 months.