Join the M25 and head north past M4/Heathrow, then past the M40 Oxford Exit at Jct 16. Take the exit at Jct 18. The slip road goes up to a bridge going across the motorway, turn left towards Rickmasworth. Head down into Rickmansworth until you arrive at a large roundabout near Rickmansworth BR station. Turn left here along the A412 towards Watford.
Follow signs into Croxley Green. Continue straight over at the two roundabouts past Croxley, then take the fifth right exit on to Harwood Road. Continue straight down, heading straight over the traffic lights, until you come to the end of the road. At the end turn left and you will now be on Vicarage Road, continue for a few hundred metres and you will see the ground on your right hand side.
There is no parking available for fans at the ground and street parking is exclusively restricted for local residents by way of matchday permits. Parking is not permitted in Watford General Hospital.
Watford town centre has several car parks, the easiest of which for access to Vicarage Road is Church Car Park on the inside of the ring-road, opposite the turn off into Vicarage Road. All town centre car parks are within a ten minute walk of the stadium.