When merging from an on-ramp, match the speed of the traffic on the motorway
Actually, this is a potential reason not to increase the speed limits. Not because people are too stupid to accelerate on them (which they are), but because some of them are so short as to make it difficult to accelerate to traffic speed before being forced to merge now.

The other day, I encountered one of those people who refuse to accelerate on an entrace ramp. Not too uncommon, unfortunately, but he was driving a late model Porsche 911 Turbo. Certainly not the fastest car in production, but at the same time, definitely the fastest car on the road.
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Bitt Faulk