Enlarge / A Comcast data cap notification. (credit: Comcast)

Comcast is bringing data caps to a bunch of new cities beginning November 1, roughly doubling the number of markets where it imposes data limits and overage fees. As before, customers will be allowed to use 1TB of data per month before being hit with overage charges of $ 10 for each additional 50GB. For an extra $ 50 per month, customers can purchase unlimited data.

Prior to the expansion, Comcast said it was enforcing data caps in 14 percent of the markets in its 39-state territory. Instead of immediately imposing caps nationwide, Comcast has been steadily rolling them out to new markets since 2012, usually adding a few at a time and gauging customer feedback before expanding to more. The caps were originally 300GB a month, but as more customers started exceeding them, they were boosted to 1TB (downloads and uploads combined) this year. Comcast says more than 99 percent of its customers use less than a terabyte of data.

Markets in 18 states will face data caps and overage fees for the first time, though other markets in some of these states were already capped.