The M4 Motorway (Junction 40 (Tai Bach) to Junction 42 (Earlswood), Neath Port Talbot) (50 mph Speed Limit) Regulations 2019The M4 Motorway (Junction 40 (Tai Bach) to Junction 42 (Earlswood), Neath Port Talbot) (50 mph Speed Limit) Regulations 2019