Gap cliff stability being monitored: TMR 15/01/2020 Facebook A boulder and other rock debris fell from the cliff above the Cunningham Highway at the Gap in the first week of the new year. Purchase this photo from Pic Store: 202853 By Jeremy Sollars The Department of Transport and Main Roads (TMR) says it has conducted “preliminary geotechnical and structural assessments” of the cliff […] Subscribe or Login to see the rest of the content. Username Password Remember Me Forgot Password