Britain's roads are becoming more congested and polluted thanks to reductions in Britain's school bus timetables, a new study claims.
The (CBT) says that an additional 100 million car journeys are created each year as a result.
The pressure group believes 300,000 non-London based children have had their public transport taken away over the past eight years alone. Pupils and parents living in the English countryside are the worst hit, the report finds.
The CBT says ministers need to address declining school transport levels if they really mean to reduce pollution and road congestion.
To make matters worse, most of the extra 100 million trips are made when roads are at their busiest, during rush-hour.
Almost four out of five councils have slashed their school bus timetables in the past eight years. Two in three local authorities today have no free buses for students aged 17 or over.
The CBT says several councils are operating threadbare services on the fewest routes legally possible. The group's Lianna Etkind says the cuts have led to many parents having to choose between working or setting their to their children's school.
The public transport campaigner claims a significant chasm has emerged between those families who live in urban areas and those who are in the countryside.
Ms Etkind says that school buses remain vital in the fight against road congestion and pollution. Taking away such transport can limit the choices of educational establishments made by children and young people, she adds.
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