crowntown100 wrote: ↑Thu Apr 01, 2021 20:46
The only place that it could happen is along the Blackwater bypass (Chiverton Cross to Scorrier), or possibly even as far as Avers Roundabout. That was reaching around 40k AADT pre-Covid, so any return to those kinds of traffic levels, combined with an increase in traffic once Chiverton Cross to Carland Cross is built and feeds into this section, could push this into widening territory, but it's unlikely due to the space constraints at the Scorrier end where it runs alongside the railway unless they were to get creative with retaining walls, and there are much longer stretches of D2 with comfortably more than those traffic levels that need that investment first.
Those flows are low for a DC. The A34 north of the M4 carries 60K and south of the M40 65K, with the A404 carrying 50K.
Using the HE Webtris site, in 2019, the AADT at Connor Downs was 26,314, with the December and January flows being 22,234 and August being 29,755, so outside peak times the S2 +1 works. However in August the westbound flows are 13,417 and eastbound 16,338 which indicates that as westbound is mainly 1 lane, locals still use the old road.
There is no data for the Hayle bypass, but at Crowlas it is again for 2019, AADT 21,157, winter 18,615 and August 23,479.
Ignoring holiday season, a single lane bypass of Crowlas would suffice, and with these flows the A30 Connor Downs and Hayle bypasses are satisfactory for the normal traffic flows.
Do not forget Cornwall Council and the HE are going to
Hamburger Loggins Moor which will be completed the same time as Chiverton to Carland, and this will assist in reducing the queues.