cause and effect paragraph

Indonesia has a unique annual tradition where thousands of peoples migrated back from city or town to rural area. This unique traditon called mudik, and it happens every year around idul fitri celebration. Most of peoples uses cars or motorcycles beside public transportations for mudik.
What we don't realize is, by using private transportation it increases the number of vehicles on the road. Because of too many vehicles, it causes traffic jam and even worst, accident.