Although I agree with the current speed limits in built up area's as in 30mph and 20mph around schools parks ect. don't you think in some cases and it seems a lot more cases, the speed limits of roads are been reduced, two lane highways that used to be 70mph widened into three lane highways and speed dropped to 50mph or even 40mph, what is the point of that. yes there are some stretches of Britain's highways you would not want to drive over 70mph on but there are plenty that could have a speed limit of over 70mph. this limit was introduced when cars were running cross-ply tyres, suspension from an old cart and brakes that kind of worked if adjusted correctly.
The problem with speed limits is that some drivers are highly competent and trained to drive safely at high speed , but you can’t have one speed limit for certain drivers and different ones for those less capable - hence we legislate for the lowest common denominator.
You also have to bear in mind that
an old granny pootling along , or a mum with two unruly children distracting her from the road might not react as you’d hope or expect when you come swooping up at 80 , no matter how good a driver you might think you are .
We all make mistakes, myself included , speed limits are there to protect us all , and generally are set for good reason .
Similarly , even back in the 50s or 60s , before the NSL was introduced, cars varied widely in performance and safety .
Yes , there would be some vehicles I wouldn’t want to go particularly fast in , but a Mercedes-Benz of that era would be surprisingly competent . Yes , earlier models had swing axle rear suspension and single circuit unassisted brakes , but they had serious stopping power , even with Alfin drums . I have owned and driven such cars at high speeds ; they’re not the death traps you imagine .
Come up to 1968 , just after NSL introduced , and try a W114 : all round dual circuit disc brakes , all round independent suspension, semi trailing arms , radial tyres ( although bias ply tyres were especially developed for the W113 being introduced back in 1963 ) and you have a very stable car which really drives just as capably as present day cars ( and I know having done 270000 miles in my 280E , including a good many on the continent ) .
There were lots of perfectly safe and stable cars back in the sixties , but again the legislators can’t have one rule for the lucky few and a different rule for the plebs .
Speed limits are set for the poorest drivers in the worst vehicles and under the worst conditions.
We do now have variable limits in certain places , but they still have to apply to all road users .