Carrying people with reduced mobility up and down stairs requires an operator. The applicable stair form is linear, but triangular and spiral ladders are not applicable. This machine is a crawler-type ladder machine, which does not need to be installed. It can be used after buying it. • Newly added patented front swivel wheel - no need to lift the front body when driving on flat ground, driving and turning more easily and effortlessly when driving on flat ground and narrow stairwells. • Innovative laser light assisted alignment - aids alignment recognition, clear and easy, and ensures that the body is perpendicular to the stairs when going up and downstairs. • Patented Anti-Roll Pedals - It is easier to retract the anti-roll bracket and get on and off the vehicle more safely. • Liftable grader wheels - step over thresholds, move forward and back as if you were on the ground. • Patented Anti-Roll Pedals - It is easier to retract the anti-roll bracket and get on and off the vehicle more safely. • Liftable grader wheels - step over thresholds, move forward and back as if you were on the ground.