Those mobile cranes that they use to erect the metal cranes that erect the blocks of boxes that investors want to pay for don't have high clearances and they also have long wheelbases, from what I remember. How comes they don't get grounded on every construction site in London? Because they're expensive, the constructors set up flat access for quick in and out installation. It can be done - it has been done - flat surfaces, obstacle free approaches. If one of those can get on and off a construction site, so can a lower lorry.
do they really ? And how do we excavate down to basement and provide level flat access ? It's about approach and departure angles and the lower the front the shallower the angles. Now out in the suburbs where it is a lovely large site there may be the luxury of a long shallow haul road, indeed on the M25 project that's what was in place. In town on projects like Bloomberg ( the mcalpine job in the city) which is fairly large in comparison to others the haul ramp was almost 45 degrees just to enable the demolition/ excavation to take place.
Also mobile cranes generally used to erect from the road , hence all those PITA closures I have to arrange.
Last one we had on site to erect was done before we dug out to 3rd basement level. So was the existing floor slab .
Once the cab is on the tower crane can self erect .
I thought that there were new designs. The ones shown look like the bin lorries ( that spinners hates as much) we have had since the 80s . That have dire visibility.
Out of pure self indulgence I showed the pics to my dad. Thinks they would work in towns but he would hate to be driving one on a motorway.
I also asked him what he felt safer in a cabover ( sat on engine) or a conventional ( engine in front) cabover won from the sheer visibility point.
Still what does he know , he only drove them for a living and nearly died in one when a " more vulnerable road user" thought it would be great to pull out and stop in front of him. The police investigators were astounded that he didn't kill the nobber. ( the forum would change to flowery daffodil if I posted the real words uttered) and some skilful avoidance ensured
All for safer designs but it has to be the correct balance of practicality and safety. And at the risk of sounding like a broken record ALL ROAD USERS working together from pedestrians looking before they step into the road, to hauliers ( note hauliers) ensuring they don't put pressure on people to bend the rules past breaking point.
It isn't down to one specific group as you can put the safest vehicle Ever on the road with the safest operator and all it takes is one vulnerable user to think they don't have to look after their own safety as well and it all falls down.
Control measures are about time cost benefit and effort to achieve. Any of them get too big and it is not going to happen , as it is not reasonably practicable. Looking out for yourself is one of the easiest to implement .