While in IFR conditions, a pilot experiences two-way radio communications failure. Which route should be flown in the absence of an ATC assigned route or a route ATC has advised to expect in a further clearance?

Explanation

Under 14 CFR 91.185(c)(1), after lost communications in IFR conditions the pilot flies the route assigned, or if vectored direct to the fix, or the route ATC advised to expect; in the absence of those, the route filed in the flight plan. Diverting to the alternate or returning off-airway is not the prescribed route.