FORSYTH COUNTY, N.C. -- Last week an Amber Alert was issued for a teenager in Forsyth County. Deputies canceled it Friday after they found 15-year-old Cassidy Bottoms safe in Sanford.

When police issue an Amber or Silver Alert, you'll see it on the electronic DOT highway boards. The boards tell people to call 511 for more information.

2 wants to know how many people call and how does it work?

Besides Silver and Amber alerts, 511 can also provide information on road closures.

Throughout this year and last, DOT says it averages about 11,000 calls a day from people wanting more information on Amber Alerts. DOT received about 21,000 within two days during last week's Amber Alert.

If you're wondering why the boards say to call 511 instead of giving a description of the person. DOT says it's for safety.

Trying to read too much information while driving 65 miles per hours can be dangerous.