2- Explain the design philosophy for a Diverging Diamond Interchange (DDI) and show the traffic flow on a schematic of the interchange. Compare the advantages and disadvantages with the regular diamond interchange. Also, explain the design criteria that should be considered for a DDI.

Q1 (A): Name and draw an interchange that contains one-way diagonal ramps in each quadrant and with two at-grade intersections provided on the minor road. (B): Speak briefly about the six warrants that according to the AASHTO should be considered when determining if an interchange is justified at a particular site. 2 log signalized

Note that for this problem 1 interchange = 2 Ramps (1 on ramp 1 off ramp)  Thank you

How many diverging conflicts are present at a 4-leg intersection where each leg is a single lane approach, as shown above? Response Feedback: NBTH with NBLT, NBTH with NBRT EBTH with EBLT, EBTH with EBRT SBTH with SBLT, SBTH with SBRT WBTH with WBLT, WBTH with WBRT

RING 1 RING 2 $1 2 DJL $5 MAJOR STREET lead-lag lag-lag none $2 $6 BARRIER = Phase Number = Protected Movement $3 MINOR STREET $4 = Permitted Movement = Pedestrian Movement In this ring and barrier diagram, what sequencing is used for the protected left turns? O lead-lead BARRIER

How many numbers of conflict are present in a 4-legged intersection?   a.12 b.8 c.4 d.6

Explain, illustrate and prove why 4-legged intersection has 16 crossing conflicts, 8 merging conflicts and 8 diverging conflicts.

A two-lane major road with 40 mph east west direction crosses a two-lane minor road with 30 mph at a 90- degree angle. The Intersection is uncontrolled. A proposal is being made to construct a building at the south-east corner of the intersection. If the building is placed 41 feet from the center of the approach lane (nearest lane to the building) on minor road, what distagce the building should be constructed from the edge of the travel way on major road to satisty sight distance requirements. Alsume each lane is 12 feet.

QUESTION 6 RING 1 RING 2 $1 1 CAL $5 MAJOR STREET $2 O none $6 BARRIER = Phase Number = Protected Movement $3 MINOR STREET $4 = Permitted Movement Pedestrian Movement BARRIER In this ring and barrier diagram, what sequencing is used for the protected left turns? O lead-lead lead-lag lag-lag

How many crossing conflicts are present at a 4-leg intersection where each leg is a single lane approach, as shown above? Response Feedback: SBTH with WBTH, SBTH with NBLT, SBTH with EBLT, SBTH with EBTH NBTH with EBTH, NBTH with SBLT, NBTH with WBLT, NBTH with WBTH WBTH with EBLT, WBTH with SBLT, EBTH with WBLT, WBTH with NBLT EBLT with NBLT, EBLT with SBLT, WBLT with SBLT, WBLT with NBLT