Given where the level crossings are in Ely, this 'level crossing work' could mean Prickwillow Road (B1382)."level crossing work" might mean a number of bridges over railways and rivers, rather than replacing a few barriers
From east to west, the road has the following features:
first crossing over the two track Ely-Norwich mainline at a skew angle of about 20 degrees, i.e. 50m between gates
three road junctions within the next 150m
66m long bridge over River Great Ouse
120m through residential area
second crossing over the two track Kings Lynn mainline at a 60deg skew angle
140m through residential area
third crossing over the two track March mainline at a muchmore sensible 80deg skew angle
200m through a residential area
two of the lines crossed have 25kV OLE, (maybe the third will be electrified as it forms part of a nationally significant cross country and freight route)
That represents a lot of serious planning to create bridges close to residential housing with decent sightlines etc.. Doesn't look trivial to me.