What is a requirement for all motor vehicles on the hard shoulder?

The requirement for all motor vehicles on the hard shoulder is that motor vehicles, with the exception of two-wheelers, must not drive on it. The hard shoulder is primarily designated for emergency stopping, allowing vehicles to pull off the road safely in case of breakdowns or emergencies. This area is not intended for regular traffic use, and allowing only two-wheelers provides some flexibility for their maneuverability while ensuring that larger vehicles, which may cause obstructions or hazards, stay off it.

Using the hard shoulder for non-emergency purposes, like driving or parking, could impede emergency vehicles or create dangerous situations for both motorists and those in need of assistance. Therefore, the stipulation that only two-wheelers are permitted reinforces safety and ensures that the primary function of the hard shoulder is maintained.