Funny you mention such a thing...........our area of the 401 is being rebuild in the next 5 years and asked if anyone in our office has suggestions. I happened to have made one.....

Directional specific ramps at all exits. This is to prevent stopping and waiting for a traffic light. Prevent collisions by traffic not having yo cross directional traffic to go the opposite way.
(EG...travel WB on hwy 401. You have to exit on road "X" and travel north......the ramp will simply merge you into the NB traffic.....to go south on road "X" the ramp starts just under the overpass and loops around to head south and merge into SB traffic.)

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Above is merely a suggestion/thought and in no way constitutes legal advice or views of my employer. www.OHTA.ca

According to the Insurance Institute for Highway Safety [quoted via Wikipedia]Having spent several weeks driving in Europe this year alone, I can attest to the fact that they move traffic along really well. They are also well policed, at least in Southern Europe.

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Fight Your Ticket!

The major problem is that here they make the roundabouts way too small. I do not mean that they should be gigantic like the one in Hamilton at Kenilworth Ave and Kimberley Dr, near Lawrence, but that is a good size for a busier junction or 5+ roadway junction. The ones I see here are way too small, and one has to slow down to 20 km/h. The worst is that some people refuse to understand the roundabouts.

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"The more laws, the less justice" - Marcus Tullius Cicero
"The hardest thing to explain is the obvious"

www.OHTA.ca & www.OntarioHighwayTrafficAct.com

Good points by HB, TC and racer! I think the roundabout at the west end of Ancaster, where Wilson meets Meadowbrook, is a classic example of a roundabout that would be a lot better if it were bigger. Drivers would likely (we can hope) be better at using them if they were more common.

Apologies in advance if this is a stupid question, but why, on the 400-series and the QEW, do we no longer see classic cloverleafs? Do they take up too much real estate? Are they too expensive to build? Some other reason? They seem such an elegant solution to the intersection problem -- all traffic just merges and nobody has an unnecessary stop.