I find it surprising that a residential area would have a speed limit of 55mph. From the driving that I've done in the UK it seems common that residential roads have a limit of 20, 30 or 40 depending on the density of the housing and whether or not there's a school nearby. I think there might be a very occasional 50 if it's an isolated house, but generally housing results in a lower speed limit.

I hope they reconsider their position.