Okay, imagine a dumper truck is a big, strong robot that carries heavy things, like dirt or rocks. But guess what? This big robot isn't very good at fitting into tiny spaces.
1. Big Size: Dumper trucks are really big! They sometimes need a lot of room to turn around or go straight. City streets can be pretty narrow, which makes it hard for these big trucks to drive safely.
2. Lots of Cars: There are many smaller cars on the city streets. If a dumper truck came driving in, it could bump into the smaller cars or block the street, making it hard for everyone to get around.
3. Heavy Loads: Dumper trucks carry heavy stuff, which means they need to drive slowly and carefully. If the streets are too busy or too narrow, it can lead to accidents.
So, that's why dumper trucks have to use bigger roads and highways instead of city streets. They help keep everyone safe!