The M4 Motorway (Junction 41 (Pentyla) to Junction 42 (Earlswood), Neath Port Talbot) (Temporary 50 mph Speed Limit) Order 2018 / Gorchymyn Traffordd yr M4 (Cyffordd 41 (Pentyla) i Gyffordd 42 (Earlswood), Castell-nedd Port Talbot) (Terfyn Cyflymder 50 mya Dros Dro) 2018