they should be about 1 foot above road surface.
The forks should be as close to the ground as possible.
The forks should be about 1 foot clear of the roadway when travelling.
When driving, the forks of a forklift should be as low as practical. This allows for the best stability while the vehicle is moving.
Low as possible
The forks should be 1 foot above ground
Up
You should reverse down a steep incline (slope) when driving a forklift that has a load on the forks.
The forks should be as close to the ground as possible.
The extended height when forks are at top.
4 inches
You always keep the forks (and the load) as low to the ground as possible. This holds true for forklifts, front end loaders, etc.
It's the distance from the highest point of the truck to the floor when the forks are fully lowered.