Looking at the aerial photograph and the OS map above you might think that the A47 has been diverted round a possible runway extension from the minor road The Drove. However I have a 1939 UK road atlas which shows that the road layout there was just the same pre-war, although it has been realigned both east and west of this point. The map also shows the minor roads which did once cross the ground where the Wittering runway is now, so pre-dates the construction of the field.