Given traffic flows for each lane group at a T junction shown in Figure below. The saturation traffic flows are as follow:

Through traffic is 1800 vphgpl

Left turn traffic is 1600 vphgpl

Right turn traffic is 1600 vphgpl

Assume that the length of yellow interval is 3 seconds and lost time is 4 seconds; the minimum green for each phase is 10 seconds and the cycle given as a multiple of 5 second. Three phases are proposed as shown

Determine cycle length and green length for each phase

If the posted speed is 40 km/h is the yellow time is enough? Minor street is sloping towards the intersection with grade of 4% while the major street is level. Assume pedestrian speed is 1.2 m/sec

Phase 1

Phase 2

Phase 3

Question 4: A crest vertical curve on a 2-way, 2-lane road is designed for 60 mph. The grades are 1.6% and 1.4%. If the tangents intersect at 20 + 00.0 and at an elevation of 500 feet meters above sea level, determine the stopping sight distance, the length of the curve, and the stations and elevations for the Beginning and End of the Vertical Curve. Assume perception reaction time is 2.5 seconds, f=0.30.

12 m

60

150

500

250

450

250

14 m