Prince George’s County parents say overcrowding on school buses and changes to bus stop locations are causing unsafe conditions for students — but school officials chalk it up to start-of-the-year adjustments.

“All counties have to work to overcome it, especially at the beginning of the school year,” said Thomas Bishop, director of transportation for the Prince George’s school system.

But Bowie resident Rachel Edwards, whose 4-year-old son, Carson, attends High Bridge Elementary School, said her concerns have been met with resistance. Edwards said she refused to get off her son’s bus Wednesday when she realized that some children did not have a place to sit, even calling police to address the situation. She said the driver ended up calling the transportation department, which sent a second bus for the additional students.

“This is unacceptable,” she said. “This is not just about a bus being late. This is a safety issue. You have little children who are standing, and they don’t know that this is wrong.”