1.3. By offsets from the tangents

Try these first

1. 1.

   Define what an offset is in surveying.

   Hint

   Think about how we measure distances from straight lines.

2. 2.

   Explain the difference between radial and perpendicular offsets.

   Hint

   Consider the angles involved with each type of measurement.

3. 3.

   What is the purpose of using offsets in setting out curves?

   • To measure distances
   • To accurately plot curves
   • To find tangent points

   Hint

   Think about why precision is important in construction.

4. 4.

   True or False: Radial offsets can only be used for very sharp curves.

   • True
   • False

   Hint

   Consider the versatility of offset types.

5. 5.

   A new road requires a circular curve with a radius of 25 m. If the distance from the tangent is gauged at 10 m, calculate the radial and perpendicular offsets.

   Hint

   Make sure to fully apply the formula as written step-by-step.

6. 6.

   In a design study, an engineer finds that a certain curve’s radius is not producing the desired outcomes. They want to redesign the curve. What principles should they ask?

   Hint

   Think about alignment and vehicle handling!