Offset

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Offset Everything in RSAP is located laterally on the highway using the lateral offset from the baseline. Offsets may be to the left or right. The offset is calculated from the centerline and not the edge of pavement. A guardrail installed with its face at the edge of an 8 ft shoulder which is on a two-lane Undivided Highway with 12 ft lanes would have an offset of 20 ft (i.e., 12 ft lane + 8 ft shoulder = 20 laterally from the baseline ).