Unfortunately what they are doing is akin to pissing in the wind, because all the motorways that are being "upgraded" to 4 lanes by removing the safety lane, already need more than at peak times (or in reality alternative routes).
If you look at a map of motorways on the continent (France, Germany, Belgium and Holland), there are multiple routes N-S, and E-W, so the traffic is spread, with alternatives if there are issues on one particular route, also many are only 2 lanes, but because of the alternatives there is far bigger capacity.
Here we have basically 2 N-S routes, and 3 or 4 E-W (spread through the length of England), and its totally inadequate for the purpose, and they also have much better (and often cheaper) public transport networks on the continent.