Have you ever seen a bike train? Picture lots of excited little kids perched on bicycles, scooters, skateboards and anything else with wheels, anxiously awaiting a signal from a parent or teacher to start pedaling and rolling to school.

Once kids take their first steps, they can't wait to keep going. But when it comes to walking to the park or school along roads, it can be a challenge for kids to safely get to where they need to go.

This week marks the second annual United Nations Global Road Safety Week and an important opportunity to highlight how to keep kids safe on roads.

I was in a 7-by-10-foot room in Coyoacán, Mexico City, when Paco saw the tweet.

“A child was hit by a car in Mexico City this morning,” he announced, and I heard the combination of frustration, sorrow and exhaustion in his voice.

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