A good idea is to reverse the wheelchair up to a flat vertical surface.
For example, a wall or a door and then measure the overall length, from the vertical surface to the tip of the wheelchair occupant's toe.(or foot platform if fitted)
Measure the widest lower level width of your wheelchair, normally the outer edges of the largest wheels.
This lets us know if it will fit into a lowered floor section or onto a ramp or chairlift.
Measure from the floor to the top of the wheelchair occupant's head, using a level surface such as a ruler or an envelope to rest on top of the head to obtain an accurate measurement.
It is important that the wheelchair user sits in their normal relaxed posture.
Often, wheelchair occupants will need to duck their heads when first entering the vehicle as entry points tend to be a little lower than the maximum interior headroom.
Some may find this easy whilst others may not so we are looking for information on how far the wheelchair occupant can lower their head to gain entry.