The Dallas North Tollway is finally opening today from 121 north up to highway 380. This is a huge expansion, 9.6 miles, in which the NTTA predicts it will save drivers 10 minutes each way verse driving on the access roads.
Even though the tollway is open, not all the ramps are open. You get your chance to get on, but don't miss it because you might not be able to get on at all.
Also, the project is not even near complete. It's only complete enough to finally allow drivers on the roads, but medians aren't done, shoulders aren't done, signs aren't done... most of the project is not done, but they set a date and they wanted to stick to it.
You can go to http://www.ntta.org/ for more information.