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D. <br />When planning for new roadways, they <br />are designed large enough to carry the <br />number of vehicles predicted to use the <br />facility through a specific build year, often <br />30 or 40 years in the future. <br />Using simulation software, planners <br />compare roadway demand (number of <br />vehicles on the road) with roadway supply <br />(carrying capacity). If a roadway begins <br />to approach or reaches its full carrying <br />capacity, congestion occurs. <br />Volume -to -capacity (WC) ratio measures <br />congestion levels on a roadway. When <br />the WC ratio begins to reach 100% of the <br />roadway capacity, vehicular level of service <br />for the facility degrades. <br />WC and vehicular level of service for the <br />City's existing transportation network show <br />the facilities where traffic improvements <br />should be considered. <br />