I haven't been able to find the INRIX data you refer to but I'm not querying their accuracy.The numbers in the INRIX annual reports I cited are for the A4 eastbound from the west end to Chiswick Roundabout, a much longer stretch which show a significant increase in peak time delays from 2019-2023.It is entirely possible that average speeds could have increased between Hogarth Roundabout and Chiswick Roundabout during this period. This would be achieved by changing the phasing at the Sutton Court Road junction and using this road, including E3 bus users can tell you the green phase going north to south can be cut to a few seconds leading to tailbacks into the centre of Chiswick.The average speed achievable on the clear section of the road to the west of Hogarth Roundabout may have increased but, in the last four years, it has not done so sufficiently to reduce the journey time along the broader stretch of the A4 we are looking at.On correlations, assuming you agree that there would be a positive correlation between Heathrow airport arrivals and traffic on the A4 and the significant increase in population density taking place on the A4 corridor will also tend to boost demand to use the road, would you not accept that, all other things being equal, congestion will rise?For the past decade or so there has been a number of factors with a negative correlation with A4 use eg regulatory - ULEZ and the Congestion Charge, social, infrastructural - improved public transport such as the Elizabeth line. The effect of these has ended or may be even reversing and I can't see other influences that would tend to suppress the number of vehicles on this road.I'll ask again, why should we not be concerned about increasing congestion on the A4 in Chiswick? It already has the third most congestion in the UK and therefore probably Europe and the problem has got significant worse from 2019-23. Perhaps this time you could answer without trying to bog the argument down in semantics, not come up with an out of context piece of data which doesn't actually prove anything and refrain from calling me a slippery dunce. I am genuinely interested in what you have to say but your refusal to address this simple and paramount question concerns me.
Jeremy Parkinson ● 32d