Geometric questions
1- A 4 lane divided highway with a 12 feet median has a highway grade of -1.5%. The minor road approach grade is 3.5%. The design speed is 45 mph for the maior road and 40 mph for the minor road. Find the right turn departure sight distance for a passenger car taking a right turn from the minor road to the major road.
2- A new four lane state highway (posted speed limit 45 mph) is planned and you as the engineer are responsible for developing cross sections. Draw a typical cross section, while keeping in mind that there is only 74 feet of R.O.WV.
The entire 74 feet of R.O.WV. must be used.
There is a requirement of a concrete barrier in the median.
Highway design standards should be implemented.
- What is the width of the median in this cross section?
- What is the width of a typical lane in this cross section?
- What is the width of a typical shoulder in this cross section?
3- A 2 lane highway with a grade of 6% has a posted speed limit of 50 mph and a design speed of 55 mph.
The minor road approach grade is -3%. Find the right turn departure sight distances for a passenger car taking a right turn from the minor road to the major road.
