Available in select cities, NavTraffic warns you of incidents like accidents, construction, sporting events, and scheduled traffic diversions, giving you plenty of time to adjust your route. In many metropolitan areas, it even monitors in real time the current average speed on some high-traffic roads. If you've got a long commute, you'll find this an especially handy tool for avoiding sitting in bumper-to-bumper gridlock.
Both NavTraffic and XM Satellite Radio require subscriptions. You can get NavTraffic alone for just $9.99 per month, or add it to your $12.95-per-month XM Satellite Radio subscription for an extra $3.99 per month. Learn about XM's programming.
Please note: XM service is available only in the lower 48 states, not available in Alaska, Hawaii, or U.S. territories. NavTraffic is currently available in most major metropolitan areas.