Looking at a recent thread over on skyscrapercity it has come to my attention has the NRA really looked at the safety aspect of the new parking layby's implemented on the newer sections of motorways built in this country.
To me there seems to be absolutely no protection from a HGV or even a car that may veer off to the left and into the parking area. I know that with zero service areas something like this was and is still needed but could they not put a concrete barrier up to prevent any accident from happening as some of these are located on corners of motorways.
Here is a great photo of one taken by csd lately on the M9 at a corner on the motorway.

And one taken by myself on the Nenagh-Birdhill stretch right at the corner of that motorway. The merging/diverging lanes are ridiciously short for a motorway standard road also.

I was on the TF1 lately in Tenerife and here is a concrete barrier seperating parked cars/houses and a local road from the main highway. This runs for kilometers where the parking layby's run for 100m or so then surely it wouldnt cost the NRA much to install some and prevent fatal accidents in the near future?

Apart from the concrete barrier or even armco barrier perhaps, what else can be done to improve the safety of these parking areas on the motorways?