Google has a bunch of traffic data from 25 US cities it collected during the Thanksgiving holiday in 2018, and the company has shared that data to give you a heads up of when to travel during Thanksgiving this year to avoid the hideous traffic that usually piles up.
Basically, wherever you are, don't get in the car between 3 p.m. and 4 p.m. on Wednesday before Thanksgiving, since that's when you'll face the worst traffic.
Google tells you the best times to start your car travels, but you're probably not going to like it - the best travel start times usually involve the very wee hours of the morning.
Here's an overview of traffic spikes that occurred during the Thanksgiving holidays in 2018 compared to typical traffic, which could very well be similar for Thanksgiving 2019.
To get the finer details, scroll down to the "When to hit the road" section at bottom of Google's report, where it tells you the best and worst times to travel before and after Thanksgiving.
And below that, you can check the expected heaviness of traffic from Wednesday and Sunday. Unfortunately, Google Maps' data doesn't tell which highways or roads experienced traffic spikes.
Google also registered when crowds were at their busiest during Thanksgiving 2018 at bakeries, grocery stores, liquor stores, movie theaters, and shopping centers from Wednesday to Black Friday, which should give you a good idea of what to expect in 2019. Just don't go anywhere at around noon.