Quote:
Originally Posted by StNorberter
I think I see your problem. none of the speeds you mention are the correct speeds.
It's not 30 to 100 or vice versa. It's 100 through the cloverleaf at 40, and then back up to 60
or
into the cloverleaf at 40, accelerate out and through the merge lane and exit at the end of the merge lane at 100.
Very easy. The problem is with traffic that hits the merge lane and stops. BUt that's a driver, not a design issue.
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I disagree. Driver error is an issue in many cases but in the case of short merge lanes on a cloverleaf with traffic levels greater than rural interchanges (think hwy 1 and hwy 12 being an okay level of service), it is a roadway problem.
When you have a cluster of vehicles looking to exit perimeter going from 100 to 40 in the span of 100 meters trying to interact with a cluster of cars looking to accelerate from 40 to 100 to enter perimeter, and to top it off have to contend with vehicles driving through at 100, its a recipe for disaster. The exiting and entering vehicles are in conflict as they are doing the exact opposite actions in a short length of space.
Making the pembina and portage interchanges with perimeter into parclos or diamonds will remove the weaving issue and neither pembina or portage will be deeply affected by having 2 additional lights, since you hit a light going 500m in either direction