The intersection review module includes both policy and diagnostic review capabilities. The policy review component checks the following intersection design elements for compliance with design policy: corner radius, turn lane design, intersection angle, and intersection sight distance triangles.

The diagnostic review component is an expert system that leads the user through a systematic evaluation of an existing or proposed intersection geometric design to identify potential safety concerns and possible treatments to address those concerns. The review considers design issues including:

• Intersection configuration: multileg intersections, skewed intersections, offset-T intersections, and more than one minor-road approach on the same side of the major road
• Horizontal alignment: intersection on horizontal curve, curve on intersection leg, and approach alignment differing between opposing approaches
• Vertical alignment: intersection on crest vertical curve, crest or sag vertical curve on intersection approach, steep grade through intersection, and continuity of minor-road profile through intersection
• Intersection sight distance

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