WCC are gravelling the lower stretches of Barking Emu. They use a mixture which bonds like cement when wet- which it is at the moment and its not been compacted in places so it would be an arse to get off your bike. Plus it messes up their work. Use the pine tree entrance if you're familiar with it.
Also if you're night riding the ruts caused by the power barrow could be interesting on some corners at speed.