I think, this really might be a cultural thing.
One of our godsons started 'high school' ("Gymnasium") this week, aged 10.
He drives there with his bike, crossing two major roads in quite a large city (Dortmund). Those of his class who live farer away come by public transport (bus/tram/underground), on their own (though with [reduced] 'pupil tickets').
His sister, aged 6, started primary school the same day: the first two weeks or so, her mother accompanies her (on bike as well walking) to her school (only one major road to cross. Then she'll do it on her own. (They trained the school way in kindergarten.)