The JNSH classifies vehicles in four classes:
- Class 1: Height not exceeding 1.7 metres and length not exceeding 5.5 metres
- Class 2: Greater than 1.7 metres high: length less than 5.5 metres or less than 1.7 metres high and greater than 5.5 metres long
- Class 3: Greater than 1.7 metres high: length greater than 5.5 metres
- Class 4: Two-wheeled or Three-wheel bikes
