The B3408 follows the original route of the A329 out of Bracknell to the west.
At the Bracknell end the road starts at a roundabout with the B3018, the A329 and a road leading to the Bracknell Town Centre Ring Road (labelled Town Centre). This is the Western Roundabout, formerly 3M Roundabout - it is fairly obvious that new roundabout stickers were stuck onto the old ones from each direction.
The S4 B3408 heads west, with a junction accessible in this direction for access to the Weather Vane Restaurant. Before you know where you are, the road gains a lane for turning off to the right and roundabout signs show up, this one with two unclassified roads (one D2 and one S2). Continue on and the jolly S4 road changes to a plain S2 road with a middle lane designed for turning left or right, with painted hatching separating which lane can use it. There is a BP station along this road.
After a while, you come to another roundabout where we meet two S2 unclassified roads serving the suburb of Priestwood and there's another similar roundabout shortly afterwards. Up until now (maybe the last roundabout) the signs have been showing Binfield B3408. Now the signs show 'Wokingham B3408 (M4) (A329(M))' or 'Wokingham B3408 (A329)'. We bear left at this roundabout to go through Popeswood.
The road becomes S2+1 and quickly changes to D2 and there's a junction with the unclassified John Nike Way which runs into an industrial estate. The alpine-looking building on the corner is the Coppid Beech Hotel. It's not long now before we reach the end of the road at the Coppid Beech Roundabout. Going straight on is 'Wokingham, Winnersh, Woodley, Earley, Reading A329 Non-motorway traffic'. Going left is 'Bracknell A329' - but that would take us back where we came. Going right is '(M4) Reading, Winnersh, Woodley, Earley A329(M)'.