There are many students on campus. They use their own private vehicles. In the morning, students are learning at the same time they arrive at the same time and in the evening the students were at school together, causing traffic problems.
The university has many students. They all use their own private cars. In the morning, the students have class at the same time and they came at the same time. In the evening, the students finished studying at the same time, causing traffic congestion.