It's from this section......

The Director of Traffic Management has identified a network of 1,500 km borough principal roads and busy bus routes that are important for traffic movement and that can be considered as strategic. These roads, together with the existing TLRN, represent 16% of London's road length but carry well over half of London's traffic

Should be in kilometres then.....

If 1 500km is 16% of the total then 9375km is the total.

Posted By: BeverlyHills0201, Jun 8, 10:48:24