Sufficient sight distance should be provided for the probable vehicle speeds on ramps and direct connectors taking into consideration the grade, vertical curve, alignment, and lateral and corner obstructions to vision. Sight distance and sight lines are especially important at merge points for ramps and mainlanes or between individual ramps. See for recommended stopping sight distances for ramps and direct connections.

The sight distance on a freeway preceding the approach nose of an exit ramp should exceed the minimum stopping sight distance for the freeway design speed, preferably by 25 percent or more. For

Decision Sight Distance

, see , for a desirable goal.