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Sight and hold this
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levelwith a vertical tree...
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or a corner of a building...

15 °

Use this page as a guide to determine slopes where you may not operate safely.
Donotoperateyourlawn moweron suchslopes.Do notmowon inclineswitha slope in excessof 15degrees(a riseof approximately2-1/2feetevery10feet). A riding
mowercouldoverturnandcauseseriousinjury.Operateridingmowersup anddownslopes, neveracrosstheface of slopes.