Why Do People Get ‘Stuck’ in Different Kinds of Traffic?

Imagine you're in a toy car race. When everyone goes straight, it's easy, like a line of toy cars moving smoothly down the track. But when people start to change lanes or slow down suddenly, it’s like the toy cars are all bumping into each other and getting stuck. That’s what happens with traffic congestion! Some days, drivers do things that make traffic worse, like changing lanes too much or stopping quickly, which makes everyone else stop behind them.