The trial closure came in at the beginning of August and so far has cost the Welsh Government a total of £806,000. Neath Port Talbot Council has also been given a further £500,000 to carry out minor works on to the road network in preparation for the trial.
Here's a breakdown of the costs:
- studies and design work £190,000
- preparatory work and installing monitoring equipment - £443,000
- daily installation and removal of closure - £106,000
- monitoring effect of trial closure - £67,000.
Initially, both the westbound on-slip and eastbound off-slip at Junction 41 were to close at peak times during the six-month trial, but in May it was confirmed that only the westbound sliproad would be subject to closures.