United States
ANSI/ITSDF B56.1-2009
SAFETY STANDARD FOR LOW LIFT AND HIGH LIFT TRUCKS

4.4 Stability

4.4.4 Users shall give consideration to special operating conditions. The amount of forward and rearward tilt to be used is governed by the application. The use of maximum rearward tilt is allowable under certain conditions such as traveling with the load lowered.

5.3 Traveling

5.3.8 (c) On all grades the load and load-engaging means shall be tilted back, if applicable, and raised only as far as necessary to clear the road surface.

5.3.10 Travel with load-engaging means or load low and, where possible, tilted back.

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Canada
Canadian Standards Association (CSA) B335-04
Safety Standard for Lift Trucks

4.9.3 Traveling

4.9.3.1 General

(h) travel with the load engaging means or the load itself low and where possible, tilted back.

6. Operator training requirements

6.10 Traveling with and without a load

The trainee shall be instructed on

(j) keeping the load engaging means or the load itself low (usually within 10 to 15 cm of the floor, depending on the condition of the surface) and tilted backward (when carrying a load, the load is tilted back only enough to support the load);

(Metric Conversion equals 4 to 6 inches.)