ergonomics and aesthetics

this is the one of the valuable example , iam sorting from the book i read.
this will explain how a such a tiny concept or observation is effecting the whole system.

did u ever think why the position of brakes and acclerator is arranged in a specific arrangement,i.e brake is always above acclerator pedal? why it is not below acclerator? how much it should be below brake pedal? and how this whole thing is going to effect he respective process?

so here i will giv answer to all the above said question. The brake pedal is above the accleraor because it is very important for the driver to remove his foot from acclerator to apply breake otherwise by mistake he can apply acclerator in the place of brakes if both of them are in the same plane. and also brake can not be below the acclerator because for the proper actuation of brake it is necessary for the exact and full application of brake which is not possible by a short leg span person if it is below acclerator.
the optimum height of the acclerator is 2.5 to 3 cm below the brake pedal.

so through this u can understand the importance of ergonomics which is going to become the most importnt thing for the designing of the vehicles.