Douglas de Lacey wrote:
Having just scraped a cyclist off the road on a corner nearby and heard
from a friend that a colleague of his had an identical accident a day or
two ago, I tried to ring the authorities to report a dangerously slippy
road. The Highways Agency said "not our problem: call the local
council"; the local council took details and said "nothing the HA will
do till the 29th; let's cross our fingers". What's the point of having
an emergency line if they can't *do* anything? More to the point, is
there anything I can do, preferably without making myself liable for any
personal damage or death which may result if another cyclist slips there?

Douglas de Lacey

Make a couple of signs saying "Very Slippery Road" and place them a
little way in each direction. IANAL but I think anything else could
leave you liable for any future accidents.