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CHAPTER 3: EXISTING CONDITIONS IN THE STUDY AREA 3.2 Transportation several potential capital improvements Demand that might address traffic congestion issues stemming from holiday traffic were modeled. The transportation demand discussion includes information regarding traffic conditions on 1-90 Holiday Congestion and surrounding roadways. Also included below Congestion along 1-90 is heaviest during summer is a discussion of other existing transportation weekends and major holidays (Memorial Day, facilities in the study area. 4th of July, and Labor Day). In the westbound direction, this regularly occurs between MP 3.2.1 Traffic Conditions 70 and MP 93 on Sundays in summer,with 1-90 traffic conditions in the study area were the most extreme congestion occurring on reviewed and modeled to determine peak the Mondays of Memorial Day and Labor Day congestion times.These analyses took place in holiday weekends. Holiday traffic volumes are 2019 and 2023 and are discussed below.Modeling approximately four times higher on 1-90 and and analysis focused on westbound traffic since three times higher on county roads than typical data indicate traffic is more dispersed in the days.Speeds drop from an average of 70 mph to eastbound direction over various weekend days. 15 mph on 1-90,and increase by approximately 5 mph on county roads, reflecting that non-local 2019 Analysis travelers tend to speed along the local roads An analysis of 1-90 and county roads within as they avoid 1-90 congestion. On those specific the Upper Kittitas County area was completed Mondays, congestion lasts for 12 hours on in 2019 (Appendix A), specifically evaluating I-90, while diversion and increased speed lasts how holiday traffic congestion on 1-90 impacts approximately 6 hours on the county roads. the local road network. As part of this effort, VOLUME I: FEASIBILITY REPORT 1-90 Corridor-Easton to Cle Elum Feasibility Study 1 34