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A sharp-eyed bus driver is being called a hero after spotting a lost 5-year-old boy shivering in the cold.

Karen Martinez drives for the Milwaukee County Transit System. Last month, she was driving along her usual early-morning when she spotted a boy out in the cold without a coat or shoes, according to the MCTS Facebook page.

RELATED: Bus driver stops bus to help elderly man tie shoe

Martinez pulled the bus over and got out to talk to the boy. He was cold and shivering, so Martinez picked him up and brought him aboard the warm bus.

She told him to find a seat while she called officials for help finding his family. She also gave him a piece of paper and a pencil so he could draw while they waited. Martinez chatted with the boy, and another passenger took off her coat and gave it to the shivering 5-year-old.

According to MCTS, the boy has later reunited with his family thanks to Martinez’s kindness.

Quick-thinking bus drivers are no strangers to keeping an eye out for citizens in need. Earlier this year, another story went viral out of Scotland, after a woman posted a heartwarming story about her bus driver pulling over to help an elderly man tie his shoelace.

“Kudos to the driver on bus service number three for getting off to tie this elderly gentleman’s shoelace,” Leah-Ashley Brown wrote on Facebook when sharing the photograph to Lothian Buses’ Facebook page.

The photo was snapped in Edinburgh, Scotland. The driver, identified as Jackie Downie by the BBC, spotted the man taking a stroll with an untied shoelace. He worried that the man would trip and fall, so he parked his bus and hopped out to lend a hand.

Downie has been getting a lot of thanks for his good deed.

“Well done Jackie as well as the many others who do a good job every day!” Louise Williams commented on the photo on Facebook.

“If only all bus drivers were like this. Most don’t even give you eye contact never mind speak,” wrote Andrea Paterson.

Another driver with the Milwaukee County Transit System saved a lost child earlier this year.

Surveillance video on a Milwaukee, Wisconsin, city bus captured the entire ordeal.

RELATED: Bus driver gives cold, crying students his own hat and gloves, then takes his kindness one step further 

According to a Facebook post by the Milwaukee County Transit System, Tiffani Lee was driving when she spotted the girl walking down the street by herself.

Tiffani pulled the bus over and asked the girl if she was OK.

“Where are you going?” Tiffani asked. “Come here. Where do you live?”

The girl was lost and scared, according to the transit system. Tiffani stayed with the girl on the bus until a police officer came to help. The girl told the officer she lived nearby.

Thanks to Tiffani, the officer walked the girl home.

“A bus driver, a police officer and a lost child. Another story of #MCTSExcellence,” the Milwaukee County Transit System wrote on Facebook.