Weaving vs. Ramp Junctions
Weaving vs. Ramp Junctions
(OP)
Could anyone tell me the advantages over a weaving section vs an on/off ramp junction section. I have analyzed both alternative, but the LOS is higher for the ramps. This does not make logical sense?





RE: Weaving vs. Ramp Junctions
Glad to see you are still in charge of the mathematics, and not the other way around. If the answer doesn't make sense, it usually means that some of the built-in assumptions are wrong, or some of the fudge factors have not been verified for your range of application.
I suggest you forget the mathematics for a while. Go to a weave section with a stopwatch, and a Video Camcorder. Then do the same for the on-off ramp. Then you have some real hard data to base your decision on. And check out for safety issues while you're at it. Weaving is OK if you have polite drivers, but can be hard yakker if some are pig headed.
Regards - Sgt John Rozentals
University Regiment (retired)
www.latviantourists.com.au
Johnp.Rz
http://www.mets.net.au
RE: Weaving vs. Ramp Junctions
RE: Weaving vs. Ramp Junctions
Since separate ramps reduce driver workload drivers make fewer mistakes.
"...students of traffic are beginning to realize the false economy of mechanically controlled traffic, and hand work by trained officers will again prevail." - Wm. Phelps Eno, ca. 1928
"I'm searching for the questions, so my answers will make sense." - Stephen Brust
RE: Weaving vs. Ramp Junctions
To get on or off a standard on/off ramp, you have unimpeded flow, whereas with a weaving section you must deal with traffic doing the opposite of you (i.e. if you are exiting, you are crossing the drive path of those entering). So, becasue an on/off ramp configuration has less conflicts than a standard weaving section, the LOS should be better.
RE: Weaving vs. Ramp Junctions
RE: Weaving vs. Ramp Junctions
The calcs from the Highway Capacity Manual don't make logical sense to me, but they are empiracal and based on a sufficient amount of research.
Thanks.