CIL road is a nickname for HWY 509 due to an old "CIL" plant on that stretch of road/hwy. When you come off hwy 59 and travel west on hwy 509, it basically dead ends at the river and that is where trucks have a good access point to get on the river. You'll find hwy 509 a few kilometers north of hwy 44. I can't answer what the CIL acronym stands for, but I am pretty sure the "L" doesn't stand for Lockport. I'll guess however.. "Canadian Industires Limeted" ??