Both the Lhr options are not thinking laterally. At the moment the M25 at this point is regularly grid locked so putting more traffic on it is going to make it chaotic. Also has anyone considered the construction phase for several years the road will become a nightmare
The report acknowledges this but says, in the timescale of the proposed runway developments, the M25 and M4 will become saturated and will need further work to cope with demand anyway, regardless of airport development.