Discussion

W. MCALONAN, Consultant (Babtie Shaw & Morton). Glasgow I would like to make the point that almost 70% of the control action for CITRAC is concerned with pre-planned closures and diversions associated with maintenance. I also hope that a dynamic system of automatic incident detection is not seen as a substitute for closed circuit television. The advantages of visual surveillance for the purpose of monitoring action taken during major events and a general safety overview.

PROFESSOR PJ. HILLS, University of Newcastle-upon-Tyne

l.What reason do you give for the lack of ramp metering facilities on more recent motorways

(notably M25 and M40) in the light of the successful experiments on the M6 which you have described?