Tuesday is a normal working day on the M4 and a fair one to measure against. If the latest Tuesday was slow, the cards and the chart will show whether it was one bad hour or a whole morning.

Each chart compares the day with the Tuesday before and with National Highways' usual speed for each hour.

The M4 on Other Days

• M4 on Mondays
  Hour by hour, westbound and eastbound
• M4 on Wednesdays
  Hour by hour, westbound and eastbound
• M4 on Thursdays
  Hour by hour, westbound and eastbound
• M4 on Fridays
  Hour by hour, westbound and eastbound
• M4 on Saturdays
  Hour by hour, westbound and eastbound
• M4 on Sundays
  Hour by hour, westbound and eastbound

For the road right now, see the live M4 speed flow map and the latest M4 traffic news, or look up any junction on the M4 junctions page.