When the B747 was under development there was some concern about taxiing and this bit of kit was designed to give potential pilots a go:
As LM says, you adjust to suit. The TriStar nosewheel was a long way behind the pilot eye position so, on a 90deg turn, the driver could be over the grass before moving the tiller.
Digressing slightly; in the B747, at mainwheel touchdown, because of body angle, the pilot eye height is about 70ft. For a first time landing the base training captain would definitely have his hand in front of the control column to give a backward tweak to warn the new (to the B747) pilot that he really should be doing something now even though his eye height was still well above that of a mil guy flying low level
