Author: Graham RossPublisher:
ISBN:
Category : Roads
Languages : en
Pages : 42
Book Description
Rural Intersection Sight Distance Criteria
Author: Graham RossEvaluation and Modification of Sight Distance Criteria Used by TxDOT
Author: Mark Douglas WooldridgePublisher:
ISBN:
Category : Roads
Languages : en
Pages : 76
Book Description
Sight distance is an important consideration in roadway design, affecting many aspects of highway safety and operations. Ramp, interchange, and intersection designs are typically completed in tightly constrained spaces with many structural, earthwork, and roadway features present that may obstruct sight distance. These features are not easily moved; if consideration of sight distance constraints is not given early in the design process, designs may be compromised and a reduced level of safety may be encountered by the public on the completed roadway. After conducting a literature review of design criteria, three case studies of interchange ramps, and a thorough review of the TxDOT Design Division Operations and Procedures Manual, recommended revisions were prepared for the manual. These revisions include material intended to clarify and extend the consideration of sight distance in roadway design.
Traffic Engineering Handbook
Author: ITE (Institute of Transportation Engineers)Publisher: John Wiley & Sons
ISBN: 1118762304
Category : Technology & Engineering
Languages : en
Pages : 688
Book Description
Get a complete look into modern traffic engineering solutions Traffic Engineering Handbook, Seventh Edition is a newly revised text that builds upon the reputation as the go-to source of essential traffic engineering solutions that this book has maintained for the past 70 years. The updated content reflects changes in key industry standards, and shines a spotlight on the needs of all users, the design of context-sensitive roadways, and the development of more sustainable transportation solutions. Additionally, this resource features a new organizational structure that promotes a more functionally-driven, multimodal approach to planning, designing, and implementing transportation solutions. A branch of civil engineering, traffic engineering concerns the safe and efficient movement of people and goods along roadways. Traffic flow, road geometry, sidewalks, crosswalks, cycle facilities, shared lane markings, traffic signs, traffic lights, and more—all of these elements must be considered when designing public and private sector transportation solutions. Explore the fundamental concepts of traffic engineering as they relate to operation, design, and management Access updated content that reflects changes in key industry-leading resources, such as the Highway Capacity Manual (HCM), Manual on Uniform Traffic Control Devices (MUTCD), AASSHTO Policy on Geometric Design, Highway Safety Manual (HSM), and Americans with Disabilities Act Understand the current state of the traffic engineering field Leverage revised information that homes in on the key topics most relevant to traffic engineering in today's world, such as context-sensitive roadways and sustainable transportation solutions Traffic Engineering Handbook, Seventh Edition is an essential text for public and private sector transportation practitioners, transportation decision makers, public officials, and even upper-level undergraduate and graduate students who are studying transportation engineering.
Examining Optimal Sight Distances at Rural Intersections
Author: Nichole L. MorrisPublisher:
ISBN:
Category : Roads
Languages : en
Pages : 94
Book Description
Decisions made regarding driver sight distance at rural intersections are complex and require considerations for safety, efficiency, and environmental factors. Sight distance, cross-traffic velocity, and vehicle placements significantly affect driver judgment and behavior at these intersections. A series of rural, two-lane thru-STOP simulated intersections with differing sight distances and traffic speeds were created and then validated by county and state engineers. Experimental data from 36 participants in a time-to-collision (TTC) intersection crossing judgment task and a rural highway thru-STOP intersection driving simulation task was analyzed to clarify the influence of rural thru-STOP intersection characteristics on driving performance and decision-making. Results demonstrated that longer sight distances of1,000 ft. and slower crossing speeds (i.e., 55 mph) were more accommodating for participants attempting to select gaps and cross from the minor road, corresponding with (1) lower mental workload, perceived risk, difficulty, and anxiousness, and (2) better performance in terms of estimated crash rate, and larger TTCs. Second, longer distances of 1,000 ft. appear to aid drivers’ responsiveness on the main road approaching an intersection, specifically when another driver on the minor road runs the stop sign. Minor road drivers positioned close to the roadway at the stop sign, compared to standard stop bar placement, tended to help reduce the speed of main road drivers. Overall,results demonstrated a systematic improvement in the performance of both minor and major road drivers with the implementation of a1,000-foot sight distance at rural thru-STOP intersections.
Highway Sight-distance Requirements: Truck Applications. Final Report
Author: Donald A. GordonGuidelines for Using Decision Sight Distance at Signalized Intersections Near Vertical Curves
Author: Paul A. BarricklowPublisher:
ISBN:
Category : Roads
Languages : en
Pages : 9
Book Description
Whereas standard roadway design ensures that stopping sight distance (SSD) is provided at all locations along a roadway, there is no standard established for when decision sight distance (DSD) is needed with respect to traffic signals. A "reduced decision zone" (RDZ) was identified in the research as the location along a roadway with a vertical curve and a traffic signal beyond the curve where SSD is provided but DSD is not. Essentially, motorists within the RDZ are provided with SSD for unexpected stopping but are not provided with the added decision-making and response time that DSD might otherwise provide as they approach the vertical curve and the downstream traffic signal. Contained within this report are techniques for determining whether an RDZ exists along an existing roadway or has the potential to exist in a proposed design. It is suggested that intersections not be located within the RDZ.
Determination of Stopping Sight Distances
Author: Daniel B. FambroPublisher: Transportation Research Board
ISBN: 9780309060738
Category : Automobile driving
Languages : en
Pages : 140
Book Description
Decision Sight Distance for Highway Design and Traffic Control Requirements. Final Report
Author: Hugh W. McGeePassing Sight Distance Criteria
Author: Douglas W. HarwoodPublisher: Transportation Research Board
ISBN: 0309099277
Category : Automobile driving
Languages : en
Pages : 95
Book Description
At head of title: National Cooperative Highway Research Program.
A Policy on Design Standards for Stopping Sight Distance
Author: American Association of State Highway Officials. Standing Committee on Engineering PoliciesPublisher:
ISBN:
Category : Roads
Languages : en
Pages : 20
Book Description