THIRUVANANTHAPURAM: The work on the 16.3-km Mukkola-Karode NH66 bypass has again hit a roadblock, further delaying its commissioning. The Geology Department issued a stop memo against the remaining work at Thangavila, alleging that the contractor L&T Constructions had excavated soil from a buffer zone adjacent to the allotted land for soil excavation in Perumkadavila panchayat near Neyyattinkara.