[foresterh]

They put up dynamic (digital) speed limit signs in Seattle (where this article is based) in the last year or do, and I've been wondering how effective they are. After reading this article I feel like this is the reason.

There is one speed limit over each lane when it's slower than the regular posted limit, which to me seems like if you see your lane slower than the one over from it, you'll merge, causing next lane to go slower.

Reading the article, and the comment above,I can now see the purpose of the dynamic signs. But unless drivers adapt a mentality that's best for the traffic and not themselves, this doesn't seem like it would work.

[coryrc]

I've yet to see someone follow them.