Oregon interstate speed limits:
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A.
are uniformly 65 mph statewide
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B.
are uniformly 70 mph statewide
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C.
vary by location Correct
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D.
are set by individual counties, not the state
The answer is "vary by location"
Oregon interstate speed limits vary by location. The manual's Interstate Speed Limits entry states that speed limits will vary on interstate highways, so there is no single statewide number to memorize. Obey whatever speed is posted on the segment you are traveling.
The traps in the wrong answers
A. are uniformly 65 mph statewide
The manual states that speed limits will vary on interstate highways, so 65 mph is not a single statewide cap. Misreading: Treats a familiar rural number as a single statewide cap, ignoring the manual's note that interstate speed limits vary.
B. are uniformly 70 mph statewide
The manual states that interstate speed limits vary; 70 mph is not applied uniformly across every Oregon interstate. Misreading: Generalizes a higher posted limit to every interstate statewide, ignoring the manual's statement that limits vary.
D. are set by individual counties, not the state
Oregon's speed limits, including those on interstates, are set in law by the state, not by individual counties. Misreading: Confuses state-set interstate speed limits with local ordinances; the manual presents speed limits as state-defined rules.
This question tests your knowledge of Speed Limits in Oregon. Source: Oregon Driver Manual, "Speed Regulations - Interstate Speed Limits," p.19..
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