Common use of Current and Forecasted Traffic Clause in Contracts

Current and Forecasted Traffic. The District 4 Office of Planning developed the traffic forecasts for the 2062 design year on December 4, 2018. The 2022 Average Daily Traffic (ADT) on SR 87 from PM 0.0 to PM 6.1 is 208,700 vehicles. The ADT is expected to increase to a projected demand of 268,400 vehicles by 2062. Also, the 2020 percentage of trucks (% trucks) is 2.39%, and it is expected to remain at 2.39% in 2062. Table 4-5 shows the current and forecasted traffic information on SR 87 from PM 0.0 to PM 6.1 for design years 2018, 2022, 2032, 2042, and 2062. ADT 202,800 208,700 223,600 238,500 268,400 DHV — — — 18,400 — % Trucks 2.39 2.39 2.39 2.39 2.39 Median lanes TI — — 9.50 10.00 11.00 Median lanes ESAL — — 1,342,000 2,775,000 5,920,000 Two right lanes TI — — 11.00 12.00 13.00 Two right lanes ESAL — — 5,366,000 11,100,000 23,683,000 Notes: — = not applicable ADT = Average Daily Traffic DHV = Design Hourly Volume ESAL = Equivalent Single Axle Load PM = post mile(s) SR = State Route TI = Traffic Index The District 4 Office of Traffic Safety provided the accident data and analysis on July 22, 2020. A total of 1,048 accidents, with one fatal accident, occurred within the project limits (SR 87 from PM 0.0 to PM 6.1) during the most-recent available 3-year period (October 1, 2016, to September 30, 2019). The actual fatal accident rate is lower than the average fatal accident rate for similar facilities statewide. The fatal accident occurred on the southbound (SB) SR 87 off-ramp to Almaden Expressway on June 16, 2019, at 06:48 hours. Vehicle one (V1) was traveling at 80 miles per hour. Due to an unsafe speed, person 1 (P1) was unable to successfully negotiate the westerly curve in the roadway. This failure allowed the left rear of V1 to collide with a pile of dirt on the east side of the roadway. V1 then lost control and rotated in a counterclockwise direction, causing V1 to leave the west side of the roadway. V1 then collided with the sound wall on the west side of the roadway two times. The force by which V1 collided with the sound wall, caused V1 to overturn three times, colliding with the dirt embankment on the west side of the roadway each time. P1 sustained fatal injuries as a result of this collision. P1 caused the collision by traveling at an unsafe speed for then-current weather/traffic conditions. Table 4-6 compares the actual accident rates within the project limits with the average accident rates for similar facilities statewide during the study period. 1 340 707 1,048 0.001 0.37 0.14 0.005 0.30 1.89 * Bolded actual accident rates are higher than their corresponding average accident rates for similar facilities statewide. Notes: acc/mvm = accident(s) per million vehicle-miles F = fatal accident(s) I = injury accident(s) PDO = property damage only accident(s) PM = post mile(s) SR = State Route The accident data indicate that the collisions within the project limits are mostly congestion related (a high number of rear-end and sideswipe type accidents), with an actual fatal accident rate of 0.001 accident per million vehicle-miles (acc/mvm) and an actual fatal plus injury (F + I) accident rate of 0.37 acc/mvm. The corresponding average accident rates for similar facilities statewide were 0.005 acc/mvm for fatal accidents and 0.03 acc/mvm for F + I accidents. The actual F + I accident rate of 0.37 acc/mvm is above statewide average. The following proposed features are expected to enhance safety and mitigate for the above average accident rate: upgrade nonstandard guardrails and median barrier, place enhanced wet/night visibility striping and shoulder rumble strips. Additional safety measures are included in the Traffic Safety Recommendation that the District 4 Office of Traffic Safety prepared and signed on July 29, 2020 (see Attachment H). Table 4-7 lists the primary collision factors for the accidents within the project limits during the study period. The primary collision factors within the project limits were mostly due to driver errors, including improper turns, speeding, and other violations. Table 4-8 lists the types of collision for the accidents within the project limits during the study period. 1. Influence Alcohol 51 4.9% 2. Follow Too Close 1 0.1%