Germany has around 13,000 kilometres of autobahn - enough to wrap most of the way across a continent. Most of it has a suggested speed of about 130 km/h, but on long sections of the open road, drivers can choose their own speed. You might see a fast sports car overtake a lorry going almost three times as fast.
Even without speed limits, the autobahn is one of the safest motorways in the world. The road is built very carefully - smooth tarmac, gentle curves, wide lanes. There are strict rules: you only overtake on the left, you have to leave a big gap, and you must move out of the way if a faster car is coming.
Driving rules in Germany are taken very seriously. You can't get a German driving licence until you're 18, and you have to take many hours of professional lessons - far more than in most countries. By the time someone passes their driving test in Germany, they have studied the rules for months.
Most German children, though, don't think about the autobahn much. They walk or cycle to school, just like in most of Europe. The autobahn is for grown-up long journeys - visiting grandparents in another city, going on holiday. Inside towns and cities, speeds are slow and the roads are full of bikes.