WASHINGTON (AP) — Across the country, school crossing guards provide a vital service protecting children as they go to and from school. Many of them say the job is rewarding. But an investigation by AP and Cox Media Group Television Stations shows it can also be dangerous.

Here are some key takeaways from the AP and Cox Media Group Investigation:

—There is no systematic way to track how many crossing guards are injured or killed each year.

A database compiled by the AP and Cox Media Group shows that at least 230 school crossing guards across 37 states and Washington, D.C., were struck by vehicles on the job over the last decade. Nearly three dozen were killed. The data, compiled from incident and accident reports requested from nearly 200 police departments, likely represents only a por

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