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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 ). </p>