It was 60mph instead of 70 between two junctions on the M1 at Tinsley.Or was it because all the traffic took a different route because that one was too slow?That's just ended because......work this one out.....air quality has improved. Now, has it improved because of the speed reduction, in which case why increase it again? Or is it just magic?There's an environmental argument against such low speeds as vehicles simply aren't designed to travel so slowly... Not to mention the fact that localised pollution is increased by virtue of traffic build up.
Lundun being a case in point as localised pollution increases in direct proportion to each drop in traffic speed/flow.
Yet, some motorways have displayed the Matrix boards to reduce the speed limit to 60mph to 'improve air quality' (supposedly)...the M1 near Sheffield being one
Or was it because there are less of the pre Euro 4 emissions vehicles about now rather than the speed.........(including lorries)