The National Academies Press

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From page 47... ... 47 This chapter identifies a list of key strategies and their strengths, weaknesses, threats, and opportunities for improving travel time reliability under the baseline and three future scenarios developed in Chapter 5. To identify the strategies and treatments most likely to have the greatest impact, a literature review focused on previous and current work of several SHRP 2 Reliability and Capacity projects, including L03, L06, L07, and C05, was conducted. Read the entire page →
From page 48... ... 48 Classification of Strategies On the basis of their general focus area, the strategies are grouped into six major categories as follows: 1. Agency management, organization, and resource allocation; 2. Read the entire page →
From page 49... ... 49 the various strategies and treatments discussed below is much more doable. Agencies with more-comprehensive strategy applications that are increasingly integrated, standardized, and comprehensive are distinguished from agencies with less-developed SO&M activities through four key institutional features (Parsons Brinckerhoff et al. Read the entire page →
From page 50... ... 50 within this category are essential for managing the sources of congestion. Agencies need to monitor travel time reliability problems as they arise and to prepare to respond. Read the entire page →
From page 51... ... 51 Vehicle Technologies Another set of strategies involves in-vehicle driver assistance systems. The Vehicle Infrastructure Integration (VII) Read the entire page →
From page 52... ... 52Table 6.3. Key Information Collection and Dissemination Strategies Strategy Treatments SWOT Technology (Low, Medium, High) Read the entire page →
From page 53... ... 53 Table 6.3. Key Information Collection and Dissemination Strategies Strategy Treatments SWOT Technology (Low, Medium, High) Read the entire page →
From page 54... ... 54Table 6.4. Key Vehicle Technologies Strategies Strategy Treatments SWOT Technology (Low, Medium, High) Read the entire page →
From page 55... ... 55 rerouting. Managed lanes, as applied in the United States, are an obvious addition to this collection. Read the entire page →
From page 56... ... 56 (continued on next page) Table 6.6. Read the entire page →
From page 57... ... 57 Table 6.6. Key Infrastructure Improvements and Demand Optimization Strategies Strategy Treatments SWOT Technology (Low, Medium, High) Read the entire page →
From page 58... ... 58 Table 6.7. Level 1 Strategies: Delay Reduction of Up to 50% Category Strategy Treatment Application to Sources of Congestion Key Quantitative Benefit Overall Cost Rangea Effectiveness– Cost Rank Information collection and dissemination Pretrip information National Traffic and Road Closure Information Weather, work zones Reduces delays (early and late arrivals) Read the entire page →
From page 59... ... 59 Work Zone Management Work zone management is a treatment that can be applied locally (such as on smaller construction projects) or regionally for larger construction projects that cross jurisdictional boundaries. Read the entire page →
From page 60... ... 60 (CCTV) , pretrip information, road weather information systems (RWIS) Read the entire page →
From page 61... ... 61 throughout an area. The application of DMSs is more common in urban areas but can also be found in suburban and rural areas. Read the entire page →
From page 62... ... 62 Managed Lanes: High-Occupancy Vehicles Lanes, High-Occupancy Toll Lanes, and Truck-Only Toll Lanes Managed lanes are applied on a variety of freeway facilities, including concurrent-flow, barrier-separated, contra-flow, shoulder-lane, and ramp-bypass metered lanes. Within a freeway context, managed lanes operate next to unrestricted general-purpose lanes, and they are also used on some arterial roadways. Read the entire page →
From page 63... ... 63 Driver Assistance Systems Driver assistance systems, such as electronic stability control, obstacle detection systems, lane-departure warning systems, and road-departure warning systems, are a treatment applied within a vehicle rather than on a particular facility type. In the future, the number of automobiles with these safety capabilities will become increasingly common. Read the entire page →
From page 64... ... 64 cameras at signalized intersections. These cameras can be applied in a variety of area types (urban, suburban, and rural) Read the entire page →
From page 65... ... 65 Changeable Lane Assignments (Reversible, Variable) Changeable lanes are applicable on arterial roadways, freeways, bridges, and tunnels to increase capacity for facilities that have directional peak traffic flows. Read the entire page →
From page 66... ... 66 accurate origin–destination information will be available, and better planning models will be developed. RFID tags will also support better dynamic pricing strategies. Read the entire page →
From page 67... ... 67 In the future, every roadway user will be a decision maker, with the power of deciding where, how and when to make every trip in a cost-efficient way. In an effort to identify potential new and emerging strategies, an extensive review was conducted. Read the entire page →
From page 68... ... 68 Information Technology and Data Sharing Forecasters say that by 2030 video calling will be pervasive and will be generating 400 exabytes of data -- the equivalent of 20 million Libraries of Congress. The phone, web, e-mail, photos, and music will explode to generate 50 exabytes of data. Read the entire page →
From page 69... ... 69 reliable traffic flow, reduced emissions, and reduced delays is the integration of such strategies. Below, some new ideas are addressed. Read the entire page →
From page 70... ... 70 Another important aspect of integration comes when different transportation modes compete for the same space on the roadway network. The future of transportation will rely on integrated systems working harmoniously at the same and different surface levels. Read the entire page →
From page 71... ... 71 Table 6.14. Integration and Cooperation Strategies Strategy Description or Application Modes Affected Impact on Reliability Combined sensors–computer– wireless link Multiple information fusion methods combining data from multiple sensors and databases; data fusion nodes communicating on ad hoc wireless network na Medium AACN systems in all vehicles Crash notification within 1 min for all crashes; network of sensors in infrastructure to detect imminent or actual events or hazards All (passenger vehicles, freight, transit, bikes, pedestrians) Read the entire page →

From page 47...

... 47 This chapter identifies a list of key strategies and their strengths, weaknesses, threats, and opportunities for improving travel time reliability under the baseline and three future scenarios developed in Chapter 5. To identify the strategies and treatments most likely to have the greatest impact, a literature review focused on previous and current work of several SHRP 2 Reliability and Capacity projects, including L03, L06, L07, and C05, was conducted.