|Here is an area to be studied, in gray, the existing developed zones, the yellow lines are the major arterial network and the red lines are an highway|
|New residential and commercial developments proposed by developers and/or city planners|
|Current levels of service of intersections during worst peak hour|
|New trips generated or attracted by the new developments and where they go|
|Expected levels of service at intersections based on projected traffic levels, with unacceptably high congestion (F and E) at two intersections to the west of the highway)|
|Interventions (usually adding lanes to certain approaches) reestablish acceptable levels of service on the intersections with levels of service worse than D|
Assumptions, "conservative" approach and overdesign
- All locations of a given land use with similar floor area (or other quantitative feature) will have a similar number of trips generated, it doesn't matter if it's a restaurant in the heart of a city or in a tiny town in the boondocks.
- Essentially all trips generated or attracted by the location will be made in cars.
- Congestion level and traffic conditions will have no effect on the number of trips made to and from that location.
|Overdesigned intersection, made to absorb the worst possible traffic flows that it can see|
Pushing developments to the fringe
|A metropolitan area where a central city is connected with smaller urban areas through highways|
Short-sightedness of the process ironically leads to congestion
|In case there is a new development in the yellow area, the traffic study may be limited in scope to the area in the red box|
|The area in a larger context, the red box is in the top left, with many trips coming from or going to highways to connect to other neighborhoods|
|...this. This particular right-of-way is nearly 500 feet wide.|