Problem 1 Discussion - Page 1 of 1
Problem 1: Maxwell Road
We’ve used this intersection to
study a number of issues. It has been a logical place to start the case
study, since it’s the intersection where the traffic volumes have changed
the most. We’ve found that the intersection’s geometry will have to
change substantially. We’ve needed a new northbound approach and we’ve
found it useful to reconfigure the southbound approach. Our best solution
uses three lanes southbound (left, through, and right) and three lanes
northbound (left, through, and right). This lets us serve the
northbound and southbound right turns concurrent with the eastbound and
westbound lefts, which shortens the cycle length and reduces delays and
We haven’t presented
all of the analyses that would be required to do a complete traffic impact
assessment. Rather, we’ve used certain conditions to illustrate
important ideas related to the use of the HCM. We’ve used the PM
Existing condition to look at arrival patterns, skipped phases, and
differences in LOS stemming from the use of data from different sources.
We’ve used the PM With condition to look at changes in LOS due to the
addition of the site-related traffic, the relationship between geometric
improvements and LOS, differences between planning and operational
analyses, and the role of uncertainty in affecting the results obtained.
We don’t know for
sure that the new configuration we’ve identified is the best.
We’ve focused only on the PM With condition. It’s possible that the AM
With or some other condition would work better with some other
configuration. That’s something you’d have to do to complete the impact assessment.
there other issues that we could have addressed? What would they be? What
technique would you have used to find the best configuration? Do you think a
more detailed analysis would have produced a different result?
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