1–
The ramp slope of more than 5% should not be designed as it will be difficult for people with physical disabilities to move.⠀
2-
The slope of the stairs should be no more than 33 °.
3-
The inconvenient size of the steps is less than 280-300 mm in-depth and more than 150-180 mm in height.
4- Standard depth range 1000 – 1500 mm.
Optimal dimensions of stair steps in public and residential buildings.