There IS a fair amount of stop and start (lights) on 380 (traveling east) past Denton, yet the traffic always seems to keep moving rapidly and ultimately is the shorter trip.
I have gotten into the habit of searching TxDot website before leaving home. Enter TxDot into search engine. The site includes specific info on construction taking place and other known delays. Not such a big issue if you have plenty of time, but if your appointment is same day, this can really help in planning time allowance.
O/t a bit, but the people in Plano and surrounding area are generally VERY congenial, at least to this out-of-towner's taste.
Happy travels everyone.