Oklahoma Permit Test 11 Question A diamond-shaped sign: Answers Alerts riders to school zones. Alerts riders to public recreation areas. Warns of existing or possible hazards. Explanation Diamond-shaped signs warn road users about existing or potential hazards. You will usually see these signs in yellow or orange. Answer Statistics 13.02 % of our users get this question wrong. This questions is relatively Easy. Oklahoma Permit Test This questions appears in the following tests: Wyoming Practice Test