Why permanent 30 mph section on 50 mph dual carriageway

[Takeoff]

Does anyone know why the A40 (westerly after Target roundabout on both carriageways) has been 30mhp
for months. There are no roadworks. This is usually a 50mph stretch.

[EllisGE]

Money.

[Ransoman]

Any potential planning applications for the area? Football stadiums, housing estates etc?