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2. Turn (angle) - Wikipedia

   en.wikipedia.org/wiki/Turn_(angle)

   The turn (symbol tr or pla) is a unit of plane angle measurement that is the measure of a complete angle—the angle subtended by a complete circle at its center. One turn is equal to 2π radians, 360 degrees or 400 gradians. As an angular unit, one turn also corresponds to one cycle (symbol cyc or c) [1] or to one revolution (symbol rev or r). [2]

3. U-turn - Wikipedia

   en.wikipedia.org/wiki/U-turn

   Making a U-turn on a curve, a slope, a narrow road, a narrow bridge, or a tunnel. Making a U-turn at a road segment signed No U-turn or painted double solid yellow or white lines or no-overtaking lines. Making a U-turn at a road segment prohibiting left turn. Not surrounding a roundabout to make a U-turn in such an intersection.

4. Turning radius - Wikipedia

   en.wikipedia.org/wiki/Turning_radius

   Diagram showing the path of a driver performing a U-turn.A vehicle with a smaller turning diameter will be able to perform a sharper U-turn. The turning radius (alternatively, turning diameter or turning circle) of a vehicle defines the minimum dimension (typically the radius or diameter) of available space required for that vehicle to make a semi-circular U-turn without skidding.

5. Road signs in the United States - Wikipedia

   en.wikipedia.org/wiki/Road_signs_in_the_United...

   Flagger ahead (symbol sign) CW20-7a Flagger ahead (text sign) CW20-8 ... Advance Right Turn Arrow (45 Degree Angle) M5-3PL Advance Left Turn Arrow (Circular Intersection)

6. Degree (angle) - Wikipedia

   en.wikipedia.org/wiki/Degree_(angle)

   One complete turn (360°) is equal to 2 π radians, so 180° is equal to π radians, or equivalently, the degree is a mathematical constant: 1° = π ⁄ 180. One turn (corresponding to a cycle or revolution) is equal to 360°. With the invention of the metric system, based on powers of ten, there was an attempt to replace degrees by decimal ...

7. Heading (navigation) - Wikipedia

   en.wikipedia.org/wiki/Heading_(navigation)

   These directions are expressed in degrees from 0–360°, and also fractions of a degree. The differences between these two directions at any point on the globe is magnetic variation (also known as magnetic declination , but for the purposes of the mnemonic, the term 'variation' is preferred).