Please answer the following questions/problems. Please show all work, including supporting materials as necessary (with appropriate highlighting). Clearly state all assumptions made, identifying the appropriate reference. Make sure to answer ALL parts of each question and show your units. 2. (10 pts) (True or False) The vertices of horizontal curves (PI) and vertical curves (PVI) should coincide. 3. For a design speed of 45 mph, determine the minimum length of a vertical curve with an uphill grade of 4% and downhill grade of -2%. (10 pts) Is this a crest or a sag curve? (10 pts) What is the value of A? (10 pts) What are the AASHTO values of H and H? (20 pts) What is the stopping sight distance of this curve? (30 pts) What is the design length of this curve?