The difference between these two types of wheel setups is that the one with four rotating wheels can go in any direction (like shopping carts at ikea) whereas the walkers with fixed back wheels can only go front or back at turning angles or straight, not completely sideways. (checkpregnancy.com)
Angle Facts Colour coded examples showing and explaining these key angles: acute angle right angle obtuse angle straight line reflex angle complete turn angles on a straight line angles around a point Save time with these handy lessons and resources. (tes.com)
The current operating conditions are detected via a steering angle sensor, four turning angle sensors and the driving speed from the ESP ® signal and the brake pedal switch. (topspeed.com)