n   The Policy Review Module checks roadway-segment design elements for compliance with relevant highway geometric design policies. It can be applied at several stages in the highway design process. For improvement projects on existing roadways, it can provide an initial assessment of how the existing geometric design compares to current design guidelines. For all projects, it can facilitate quality-assurance checks throughout detailed design and design review.   WSDOT-specific policy  will be provided for the module.  More

n   The Crash Prediction Module will estimate crash potential for a design alternative, including all roadway segments and intersections. Estimates will be quantitative and will include the number of crashes for a given roadway segment or intersection as well as percentage of fatal and severe crashes. More

n   The Design Consistency Module will identify segments of a roadway design that are inconsistent in terms of drivers’ operating speed, which may increase crash potential. The evaluation also provides quality-assurance checks at both preliminary and final alignment designs. More

n   The Intersection Review Module has both policy and diagnostic review capabilities. The policy review component checks the intersection design elements of corner radius, turn lane design, intersection angle, and intersection sight distance for design policy compliance. The diagnostic review component evaluates the geometric design of an existing or proposed intersection to identify potential safety concerns and suggests possible treatments to address those concerns. The Intersection Review Module can provide useful input to project scoping, preliminary engineering, and design review. More

n        The Traffic Analysis Module uses the TWOPAS traffic simulation module to estimate traffic quality of service measures for an existing or proposed design under current or projected future traffic flows. This module is particularly useful during project scoping and preliminary engineering to evaluate the operational performance of alternatives to two-lane cross sections, including passing lanes, climbing lanes, and short four-lane sections.  More

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