|Location Map ( geo)|
|From:||Whipsnade (W) (SP994187)|
|Via:||Kensworth, Slip End|
|Distance:||7.8 miles (12.6 km)|
|Meets:||B4506, B4541, A5, A505|
|Route outline (key)|
Starting from a junction with the B4506 just southeast of that road's northern terminus on the B489, we first head southeast and climb steeply up the Dunstable Downs. A high security fence on the right-hand side marks the boundary of Whipsnade Zoo. We pass the zoo's visitor car park on the left and public entrance on the right before going through a gate (usually left open) to enter Whipsnade village. We cross the expanse of the green and pass a turn for the village's other tourist attraction: the National Trust's Tree Cathedral. Having come close to practically no other buildings we pass through another open gate to reach Whipsnade Heath, meeting the B4541 at a roundabout.
After a gentle zigzag the B4540 reaches the far more obvious village of Kensworth and runs along Common Lane before descending Lynch Hill back across the fields. At the bottom is the A5, met at a triangular junction in the middle of which stands with the Packhorse pub. The A5 now takes over our route for about a mile until, at the start of the Markyate bypass, the B4540 sets off again at a left turn controlled by traffic lights.
On a more-or-less dead-straight alignment the route passes a smaller animal park and then runs through the village of Slip End. After a tunnel under the M1 just north of J10 (the motorway is wider than expected here as the slip roads haven't yet joined it) we reach a T-junction on the edge of a golf course. Here we turn left to pass between the golf course and the motorway before turning right at another T-junction a kilometre further on.
Now, having arrived in the suburbs of Luton, we head east up Farley Hill, initially passing a park on the right but soon the route becomes fully residential. On the approach the town centre the road becomes semi-industrial. A flyover carries the A505 inner relief road over our route, and the road ends here at a very tight GSJ.