The Stage 1 SPICE Tool aids in determining a preferred alternative for a given ramp terminal intersection type by providing an objective, quantifiable basis to compare the safety performance of different ramp terminal intersection types.

Appendix L, Section 4

provides a link to acquire the SPICE spreadsheet tool. Where ramp terminal intersections are being compared, the tool provides for both ramp terminal intersections to be analyzed and the results combined for the entire interchange.

The tool automates the SPF and CMF selection process. The types of ramp terminal intersection control strategies that can be analyzed include a conventional traffic signal, a crossover traffic signal of a DDI, or stop control on the ramps. As of 2024, SPFs or CMFs are not available for roundabout ramp-terminal intersections. Use the stand-alone roundabout intersection and run it for each ramp terminal, as a suitable substitute until SPICE is updated.