See the intersection of two 2lane oneway streets on the acco

See the intersection of two 2-lane one-way streets on the accompanying formula sheet. A substantial fraction of the traffic from each approach turns at the intersection.

a How many light phases are needed, two or four (green arrows)? Explain

b Considering the proportions of traffic taking a turn, what control sign should be placed at an appropriate distance before the intersect that governs lane useage (both approaches)

c From the data given on the plan, with both approaches, N=2, which direction (EB or WB) has a higher 100% green capacity (s_i) from the base S_o =1900 pcphpl,

d This is an urban area, with traffic lights in close succession on each street. For the EB, the preceding street is 500\' away. A a cruising speed of 25 mph.t that light, the perception-reaction time is measured at 3 seconds. The average person accelerates at 4.0 ft/sec² to cruising speed 35 mph. To get good progression, what time should the light at our EB street turn green after the preceding intersection light turns green? What is name for that time interval?

Parking 300 I 250 700 12-ft lanes, 15% HV, level grade, high parking activity, 10 buses/hr stop, .no-CBD area 425 Bus stop 10-ft lanes, 0% HV, 5% downhill, medium parking activity, no bus stops, non-CBD area Figure E4.33

Solution

1. Four no of light phases are required, since it is a one way 2lane street.

2. Control SIgnboard of \"Stop\" is reequired before the intersection in order to avoid accidents.

3. WB has higher 100% green capacity.