Big difference between some old duffer self declaring they are fit to drive and can see, and a truck/bus license medical which must be done by a doctor
Unfortunatly there is also massive loop holes in the truck/bus license system as even if you fail, the onus is on the driver to inform their employer that they no longer have a license, so many drivers keep it secret and continue working without a license.
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It's exactly the same for car drivers, if they get disqualified they have to inform their employers if their job involves any kind of driving. How many disqualified drivers do you see on those police programs getting caught still driving.
According to stats drivers aged 70 and over were involved in three to four times fewer accidents than men aged between 17-21 but by your reckoning the age to start driving should be 22 and you should be put off the road at 60.
In December 2017 the UK were 45,000 - 50,000 HGV drivers short and that number is increasing every year but you want to create an even bigger shortage by putting them off the road earlier. You do realise that
all goods in shops travel by lorry at some stage.
Tarring all older drivers, car, truck or other, with the same brush is just crazy, more so when the statistics prove you totally wrong.