Plan extra time during rush hour; roads leading to Heathrow, including the M4, often experience congestion

https://cesarksrk986.theglensecret.com/heathrow-airport-map-for-arrivals-and-departures-access-and-transport-1

Plan extra time during rush hour; roads leading to Heathrow, including the M4, often experience congestion, especially around junctions and airport exits.