The Washington Post recently mapped out just how far you can get out of town on a Friday afternoon in major American cities in just one hour.

The Post's Sahil Chinoy used traffic information culled from cell phones and car sensors by the location data company Here Technologies to map out travel times from downtown neighborhoods at 4 p.m., 7 p.m., and 10 p.m., showing how car travel varies by city and time on a Friday night. (They're all estimates based on July 28 data.)

Unsurprisingly, considering geography and city culture, the answer can vary a lot. Compare Southern California and Northern California, for instance. In L.A., well-known for its horrendous traffic, an hour can't even get you through the county. You'll be able to travel 25 miles in that time period, at best—probably while suffering through that weird phenomenon where all the cars on the road slow down for seemingly no reason. But in Sacramento, you speed through up to 50 miles at rush hour. (You can get more than 50 miles from Las Vegas, too, but it'll mostly land you in the middle of the desert.)