It has been placed over melting tar on the road about 25km west of Gingers Creek not far past the 80km/h zone.
He says there are warning signs in place but was critical of the thick sand left behind.
RMS says “:further surface treatment is required”.
“Roads and Maritime Services is working with Walcha Council to carry out this work in the coming weeks, taking into account appropriate weather conditions required for this treatment,” the spokesperson says.
The molten tar lines are “right on the line your bike is going to take”, Ken says.
These photographs were taken when the temperature was 31C.
Melting road surfaces have also been encountered on recent roadworks on the mountain section of the Oxley Highway.
“It is already getting slippery on the new surface that is only a few weeks old, on the bottom half of the mountain,” Ken says.
“It will be ripped to bits by the end of summer and even more dangerous.
The RMS told us last week it is “investing in the safety of Oxley Highway with a significant package of work recently implemented along the corridor”.
Roads and Maritime undertook resealing work in November and December on the Oxley Highway between Toms Creek and 85 kilometres west of Wauchope, which includes work in the mountain section.
“This reseal was comprised of a spray seal mix of bitumen and aggregate,” the spokesperson says.
“It is acknowledged motorbike riders frequently use the Oxley Highway for recreational purposes.
“Riders need to take safety precautions at all times while riding and this includes being aware of the road environment, particularly during extreme temperatures at this time of year – which can affect road surfaces.”
From Sunday (January 13, 2019) there will be lane closures at Spencers Cutting for roadworks on a 1.2km section of the highway.