I had about 7.5 years of travelling on the M4 every morning to Brizz, leaving at 6:00am and returning no later than 16:00pm. On the times the tunnel was blocked returning, I'd come off at Magor services and take the road that links to the A48 Southern Distributor past Spytty Park & Transporter bridge and link up at Tredegar Park. Trouble was a lot of others were of the same mind.