Dixmont/Etna: I-95 northbound will be closed from Exit 167 (Dixmont /Etna) to Exit 173, (Carmel) starting at 9:00 am today, December 21st to allow Maine State Police to facilitate the recovery of a tractor trailer that went off the road at mile marker 171. Detour Route C will be used, which will be marked with appropriate signage. This closure could last up to 4 hours.