Until last weekend I thought that the missing 12.5 miles of I-355 Toll-way in Chicago wouldn't really be a big deal for me. I always know I-355 is there so I'll just drive on it and let TT do its thing.\r\n\r\nLetting TT "do its thing" turns out to be a big hassle in reality.\r\n\r\nPlan a route, start driving, get on unmapped expressway, & watch your TT go nuts.\r\n\r\nThe arrow is tracking properly off-road as expected.\r\n\r\nApproaching major roads as they pass overhead causes...\r\n\r\n1. the arrow to spin in an attempt to snap onto the overpass.\r\n2. recalculation of route while ordering you to turn left or right onto the road passing overhead.\r\n\r\nEvery single overpass, which is every single mile.... "[I]after 300 yards, turn left[/I]", "[I]turn left[/I]", *recalculating*, "[I]after 300 yards, turn right[/I]", "[I]turn right[/I]", *recalculating*, "[I]turn ahead[/I]", "[I]turn left[/I]", *recalculating*, etc. etc.\r\n\r\nSo pretty much, you have to delete your planned route, wait until you get back onto a mapped road and re-enter your route.\r\n\r\nAnd if you're on the un-mapped expressway and want to locate a POI so you get off for food or re-fuel, forget about setting a route until after you get back on the mapped roads.\r\n\r\nThis is not TT's fault. For some mysterious reason, TeleAtlas and Navteq have not yet made the corrections. The State of Illinois was quoted in the Chicago Tribune as having reported the new Expressway to them more than 3 months before the road opened to traffic.