Collision Analysis. Collision data from the Caltrans District 4 Traffic Accident Surveillance and Analysis System (TASAS) was compiled for the I-680 corridor from PM R8.120 in Alameda County to PM R2.870 in Contra Costa County. Collision information is provided for the most recent three years of complete data: January 2017 through December 2019. Table 4-3 summarizes the TASAS collision data as it relates to the statewide averages for similar facilities. Collision rates are expressed as accidents per million vehicle miles traveled. Table 4-3: Collision History for I-680 Facility Number of Collisions Collision Rate (collisions/million vehicle miles) Total Fatal Fatal + Injury Actual State Average
Collision Analysis. The CONSULTANT shall obtain the collision reports via the DEPARTMENT’S Crash Analysis Reporting system (CARs) and any available collision database approved by the DEPARTMENT. The CONSULTANT shall prepare a collision summary and collision diagram for the study location. The summary and diagram shall depict as a minimum the most recent 12 months for which data is available. Collision diagrams shall be drawn on standard DEPARTMENT forms contained in the MUTS or on other DEPARTMENT approved forms. Collision diagrams may be drawn on aerials. A collision analysis shall be performed based on the prepared collision summary and diagram. Task Products: • Collision summary • Collision diagram • Collision analysis Subtask 10A: Additive - Additional 12 Month Analysis When additional years of data are to be analyzed this activity may be authorized with Task 12.
Collision Analysis. The District 3 Office of Traffic Safety and Investigations provided the following collision history and analysis for a five-year period from January 1, 2015, to December 31, 2019 from the Traffic Accident Surveillance and Analysis System (TASAS). The Tables below (TASAS Table B Collision Rates (01/01/2015 - 12/31/2019) summarize and compare the actual collision rates for the segment of the highway to the average rates for similar facilities throughout the State. The Total collision rates include all reported collisions: Fatal, Injury, and Property Damage. The Transportation Analysis Report (TAR, Section 7.3 Roadway Safety) States Alternatives 2A through 5A, and 2B would reduce congestion compared to Alternative 1 (no build). Reducing congestion and increasing the average speed to or near the free-flow speed would reduce congestion-related collision types, such as the most common type in the project area, rear end collision. TAR Alternatives 2 through 6, 8, and 9 (as compared to PA&ED Alternatives 2A through 6A, and 2B) would be expected to lower the collision rate since these alternatives add a lane in most of the study area. Traffic congestion under the preferred alternative would affect trucks similarly to passenger vehicles in the general purpose lanes; therefore, reduced travel times for the preferred alternative would perform well for both vehicles and trucks to reduce collisions.1
Collision Analysis. Consultant shall perform collision analysis using information obtained in Tech Memos 1, 2 and 3. Analysis must include collision patterns, high-frequency collision locations, severe collision locations, evaluation of causes, and potential countermeasures.
Collision Analysis. Traffic collision data for the SR-91 freeway and interchange ramps within the project study limits were obtained from Caltrans Traffic Accident Surveillance and Analysis Systems (TASAS) Table B and TASAS Selective Accident Retrieval (TSAR) for a 3-year period between July 1, 2013 and June 30, 2016.
Collision Analysis. The accident data analyzed on the mainline were from the period of June 30, 2017 and June 30, 2020. County- Route Post Mile Total Collisions Fatal Fatal + Injury Actual Average (F) (F+I) (F) (F+I) Total (F) (F+I) Total Yolo-50 0.0/2.5 292 4 97 0.013 0.41 0.98 0.003 0.26 0.82 Yolo-80 4.3/11.4 722 3 249 0.003 0.23 0.68 0.006 0.22 0.65 There was a total of 292 accidents on Yol-50 from PM 0.0 to 2.5, with 4 fatal and 119 injury accidents. The collision data indicate that primary collision factors are related to motorist’s driving behaviors with 60% due to speeding and 13% due to improper turns by vehicles. The type of collisions includes 59% rear end, 19% sideswipe, 16% hitting objects, and 2% broadside. There was a total of 722 accidents on Yol-80 from PM 4.3 to 11.4, with 3 fatal and 246 injury accidents. The collision data indicate that primary collision factors are related to motorist’s driving behaviors with 54% due to speeding and 14% due to improper turns by vehicles. The type of collisions includes 57% rear end, 26% sideswipe, and 14% hitting objects. The actual collision rates for both routes are slightly higher than the statewide average rates but are not considered statistically significant. The majority of the collisions on I-80 and US 50 occurred during the morning and afternoon commute times, which indicates congestion related collision pattern. This project will rehabilitate existing pavement and may address non-congestion related accidents by providing a smoother and more rideable pavement, replacing existing open grade asphalts, upgrading guardrails and replacing traffic signs and stripes.
Collision Analysis. The CONSULTANT shall obtain the collision reports via the DEPARTMENT’S Crash Analysis Reporting system (CARs) and any available collision database approved by the DEPARTMENT. The CONSULTANT shall prepare a collision summary and collision diagram for the intersection under study. The summary and diagram shall depict as a minimum the most recent 36 months for which data is available. Collision diagrams shall be drawn on standard DEPARTMENT forms contained in the MUTS or on other DEPARTMENT approved forms. Collision diagrams may be drawn on aerials. A collision analysis shall be performed based on the prepared collision summary and diagram. Task Products: • Collision summary • Collision diagram • Collision analysis STUDY TYPE IV: COMPOSITE STUDIES Purpose The composite study is designed to supplement Study Types I, II, and III as needed and to enable the DTOE or the PM to utilize the services of the CONSULTANT in solving a variety of traffic problems. This study requires the DTOE or the PM and the CONSULTANT to develop the study package for a particular traffic problem by selecting appropriate tasks defined herein. Basis of Payment This study is designed to be flexible; therefore each task shall be priced individually. Any combination of tasks may be selected for a particular composite study or as a supplement to Study Types I, II, and III. Payment for each composite study will be the summation of the individual prices for selected tasks. Period of Performance The time period allowed for completion of a composite study shall be based on the types of tasks to be performed. The normal period allowed for other types of studies in this contract should be used as a general guide in determining the period of performance for a particular composite study. The PM and the CONSULTANT will determine a mutually acceptable performance period and due date. Scope of Work This section specifies the work tasks which may be performed by the CONSULTANT for a particular composite study; the responsibilities of the CONSULTANT and the DEPARTMENT, and the work task products to be developed by the CONSULTANT and delivered to the DEPARTMENT. Task 1: 8-HOUR TURNING MOVEMENT COUNT (w/Bicycles & Pedestrians) An 8-Hour TMC shall be taken for those hours encompassing the morning, midday peak and afternoon traffic periods and/or peak periods during which warranting volumes exist and an off-peak period. Each period shall normally consist of the eight (8) consecutive 15-minute intervals (2 ho...
Collision Analysis. Activity 3 requires students to use the Law of Conservation of Momentum to solve for specific variables. Activity 4: Impulse Activity 4 introduces the concept of impulse and involves two demonstrations.
