2.55. Two straights, which meet at an intersection angle of 135°, are to be connected by a circular curve of radius 60 m...

Try these first

1. 1.

   Define a circular curve.

   Hint

   Think about how roads transition from straight to curved.

2. 2.

   What is an offset?

   Hint

   Relate this to setting out conditions for curves.

3. 3.

   What is a circular curve?

   • A curve connecting two straight paths
   • A straight path between two curves
   • A type of road material

   Hint

   Think about road design.

4. 4.

   True or False: Offsets are measurements taken perpendicular to the centerline.

   • True
   • False

   Hint

   Consider how curves are aligned.

5. 5.

   Calculate the radius needed for a circular curve connecting 45 degrees and how you would set up offsets of 10 meters.

   Hint

   Refer to the curve formulas as discussed.

6. 6.

   Design a roadway with curves at angles of 90° and 135° using different radii; how would their offsets differ?

   Hint

   Use the relationships established in the current section.