Continuing from the William Street / Wellington Street junction, in the centre of Slough, the road heads westwards towards Maidenhead.
The short stretch of dual carriageway is Wellington Street, then briefly on the most western end of the High Street, over the railway bridge for the line between Slough and Windsor Central Station.

The Bath Road begins on the west side of the bridge.
On the left is Slough's 1936 Town Hall, now abandoned by the local council, and on the right Salt Hill Park.

The next major road intersection is by the Three Tuns Pub where the A4 crosses the A355.
This road goes north towards Farnham Royal, Farnham Common, Beaconsfield and the M40 at junction 2.
To the south, it goes towards the M4 (junction 6, Slough Centre) and Windsor.

The route at this point runs parallel to both the Great Western Main Line and the M4.
 The road continues past the southern fringe of Slough Trading Estate.

On Slough's western boundary is the Huntercombe Spur roundabout linking the A4 to junction 7 of the M4 motorway.
Here the dual carriageway ends.
The road bends right at Taplow and passes under a high railway bridge, then over the River Thames flood prevention channel.

The road then goes over Maidenhead's old bridge Maidenhead Bridge, spanning the River Thames, and into the eastern outskirts of Maidenhead.

Along Bridge Road, St Cloud Way and Bad Godesberg Way respectively.
The centre of Maidenhead is reached at the roundabout that forms the junction with the A308.
 Turning northwards on the A308 would lead to the A404 towards Marlow and High Wycombe.
Southwards, the A308 heads towards Windsor and provides an opportunity to branch off for junction 8/9 of the M4.
Continuing from the William Street / Wellington Street junction, in the centre of Slough, the road heads westwards towards Maidenhead. The short stretch of dual carriageway is Wellington Street, then briefly on the most western end of the High Street, over the railway bridge for the line between Slough and Windsor Central Station.
The Bath Road begins on the west side of the bridge. On the left is Slough's 1936 Town Hall, now abandoned by the local council, and on the right Salt Hill Park.
The next major road intersection is by the Three Tuns Pub where the A4 crosses the A355. This road goes north towards Farnham Royal, Farnham Common, Beaconsfield and the M40 at junction 2. To the south, it goes towards the M4 (junction 6, Slough Centre) and Windsor.
The route at this point runs parallel to both the Great Western Main Line and the M4.  The road continues past the southern fringe of Slough Trading Estate.
On Slough's western boundary is the Huntercombe Spur roundabout linking the A4 to junction 7 of the M4 motorway. Here the dual carriageway ends. The road bends right at Taplow and passes under a high railway bridge, then over the River Thames flood prevention channel.
The road then goes over Maidenhead's old bridge Maidenhead Bridge, spanning the River Thames, and into the eastern outskirts of Maidenhead.
Along Bridge Road, St Cloud Way and Bad Godesberg Way respectively. The centre of Maidenhead is reached at the roundabout that forms the junction with the A308.  Turning northwards on the A308 would lead to the A404 towards Marlow and High Wycombe. Southwards, the A308 heads towards Windsor and provides an opportunity to branch off for junction 8/9 of the M4.
A4 road (England)