Roadway Prism
Defined in the standard specifications of 3 state transportation agencies. Each definition below is the agency’s own text, with the section it comes from — they do not all say the same thing, and on a contract the difference is the point.
Definitions are quoted from state-authored public specification books. This page carries no I-Code-derived terms.
The portion of the roadway defined as the prism of embankment situated beneath the shoulders and pavement structure and inside the lines projected downward and outward on a one -to-one slope from the outside edges of the roadway shoulders to their intersection with the base of the embankment.
Section 101 — DEFINITIONS AND TERMS →The engineered/structural portion of the highway, that includes the pavement structure plus the area between the roadbed shoulders or back of curb, extending downward and outward at the slope of 2.0H:1.0V to the intercept of natural ground, removal limit, or slope of embankment keying benches. Included elements are the roadway pavement structure, embankment fill, foundations for embankment, and soft spot excavation/backfill. Embankment fill outside of the 2.0H:1.0V slope is not considered part of the roadway prism.
Section 101 — GENERAL, ABBREVIATIONS, AND DEFINITIONS →The Roadway construction limits within the outside limits of the side slop es.
Section 101 — Abbreviations, Symbols, T erms, and Definitions →