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    <title>Transport Research International Documentation (TRID)</title>
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Short-Term Traffic Prediction with Balanced Domain Adaptation</title>
      <link>https://trid.trb.org/View/2018939</link>
      <description><![CDATA[Short-term traffic forecasting has been a hot topic in the intelligent transportation systems field. The traditional traffic forecasting methods mostly fix traffic sensors. However, most sensors are subject to bad conditions, leading to noisy and insufficient raw data. Recent advances have provided new traffic prediction opportunities. For example, the transfer learning method takes advantage of data trained on one good dataset and transfers the knowledge to others with bad data. Existing applications do not consider the underlying data distributions sufficiently, limiting the prediction performance. The authors propose a transfer learning-based traffic flow prediction framework using the Balanced Domain Adaptation (BDA) method. Various regression models are fed into the framework to evaluate a good data source and predict bad target datasets. A case study using data from the Highways England is conducted. The results show that the proposed BDA-based framework can match the distributions between traffic flow datasets and significantly improve prediction accuracy.]]></description>
      <pubDate>Tue, 01 Nov 2022 09:21:20 GMT</pubDate>
      <guid>https://trid.trb.org/View/2018939</guid>
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      <title>Highways England 2020 National Accreditation Verification for Sideway-Force Skid Resistance Devices</title>
      <link>https://trid.trb.org/View/1957145</link>
      <description><![CDATA[Because reliable survey data are crucial to maintenance of road networks, Highways England holds annual accreditation trials for its Sideways Force Skid Resistance devices supported by quality assurance for the devices. The devices must meet the obligatory trial criteria to be allowed to perform accredited surveys on public roads. This report covers the amended 2020 trial run by TRL Limited during the COVID-19 pandemic.]]></description>
      <pubDate>Fri, 29 Jul 2022 09:21:09 GMT</pubDate>
      <guid>https://trid.trb.org/View/1957145</guid>
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      <title>Highways England 2020 National Dynamic Plate Test Device Accreditation Trial</title>
      <link>https://trid.trb.org/View/1957144</link>
      <description><![CDATA[Because reliable survey data are crucial to road network maintenance, Highways England holds annual accreditation trials for its Dynamic Plate test devices (falling weight and heavy weight deflectometers) supported by quality assurance for the devices. The devices must meet the obligatory trial criteria to be allowed to perform accredited surveys on public roads. This report covers the 2020 trial run by TRL Limited, held on the Horiba-MIRA proving ground, September 22-24, 2020.]]></description>
      <pubDate>Fri, 29 Jul 2022 09:21:09 GMT</pubDate>
      <guid>https://trid.trb.org/View/1957144</guid>
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      <title>Highways England 2021 National Accreditation Trial for Sideway-Force Skid Resistance Devices</title>
      <link>https://trid.trb.org/View/1957774</link>
      <description><![CDATA[Reliable survey data are crucial to maintenance of road networks, therefore Highways England holds annual accreditation trials for its Sideways Force Skid Resistance devices supported by quality assurance for the devices. The devices must meet the obligatory trial criteria to be allowed to perform accredited surveys on public roads. This report covers the 2021 trial run by TRL and held in the week beginning April 19, 2021.]]></description>
      <pubDate>Tue, 12 Jul 2022 09:43:14 GMT</pubDate>
      <guid>https://trid.trb.org/View/1957774</guid>
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      <title>Highways England 2019 National Accreditation Trial for Sideway-Force Skid Resistance Devices</title>
      <link>https://trid.trb.org/View/1957737</link>
      <description><![CDATA[Reliable survey data are crucial to maintenance of road networks, therefore Highways England holds annual accreditation trials for its Sideways Force Skid Resistance devices supported by quality assurance for the devices. The devices must meet the obligatory trial criteria to be allowed to perform accredited surveys on public roads. This report covers the 2019 trial conducted by TRL Liimited in the week beginning March 25, 2019.]]></description>
      <pubDate>Tue, 12 Jul 2022 09:43:14 GMT</pubDate>
      <guid>https://trid.trb.org/View/1957737</guid>
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      <title>Highways England 2021 National Deflectograph Accreditation Trial</title>
      <link>https://trid.trb.org/View/1957700</link>
      <description><![CDATA[Reliable survey data are key to road network maintenance, therefore Highways England holds annual accreditation trials for its deflectographs supported by quality assurance for the devices. The deflectographs must meet the obligatory trial criteria to be allowed to perform accredited surveys on public roads. This report covers the 2021 trial performed by TRL Limited, held on the HORIBA-MIRA proving ground, February 23-25, 2021.]]></description>
      <pubDate>Tue, 12 Jul 2022 09:43:14 GMT</pubDate>
      <guid>https://trid.trb.org/View/1957700</guid>
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      <title>Highways England 2018 National Dynamic Plate Test device Accreditation Trial</title>
      <link>https://trid.trb.org/View/1957590</link>
      <description><![CDATA[Reliable survey data are crucial to road network maintenance, therefore Highways England holds annual accreditation trials for its Dynamic Plate test devices (falling weight and heavy weight deflectometers) supported by quality assurance for the devices. The survey devices must meet the obligatory trial criteria to be allowed to perform accredited surveys on public roads. This report covers the 2018 trial run by TRL Limited, held on the Horiba-MIRA proving ground, September 25-27, 2018.]]></description>
      <pubDate>Tue, 12 Jul 2022 09:43:14 GMT</pubDate>
      <guid>https://trid.trb.org/View/1957590</guid>
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    <item>
      <title>Highways England 2019 National Deflectograph Accreditation Trial</title>
      <link>https://trid.trb.org/View/1957639</link>
      <description><![CDATA[Reliable survey data are key to road network maintenance, therefore Highways England holds annual accreditation trials for its deflectographs supported by quality assurance for the devices.  The deflectographs must meet the obligatory trial criteria to be allowed to perform accredited surveys on public roads,. This report covers the 2019 trial performed by TRL Limited, held on the HORIBA-MIRA proving ground, March 5-7, 2019.]]></description>
      <pubDate>Tue, 12 Jul 2022 09:43:14 GMT</pubDate>
      <guid>https://trid.trb.org/View/1957639</guid>
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      <title>Highways England 2020 National Deflectograph Accreditation Trial</title>
      <link>https://trid.trb.org/View/1957556</link>
      <description><![CDATA[Reliable survey data are key to road network maintenance, therefore Highways England holds annual accreditation trials for its deflectographs supported by quality assurance for the devices. To be allowed to perform accredited surveys on public roads, the deflectographs must meet the obligatory trial criteria. This report covers the 2020 trial performed by TRL Limited, held on the HORIBA-MIRA proving ground, March 10-11, 2020.]]></description>
      <pubDate>Tue, 12 Jul 2022 09:43:14 GMT</pubDate>
      <guid>https://trid.trb.org/View/1957556</guid>
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    <item>
      <title>Highways England 2019 National Dynamic Plate Test device Accreditation Trial</title>
      <link>https://trid.trb.org/View/1957516</link>
      <description><![CDATA[Reliable survey data are crucial to road network maintenance, therefore Highways England holds annual accreditation trials for its Dynamic Plate test devices (falling weight and heavy weight deflectometers) supported by quality assurance for the devices. The devices must meet the obligatory trial criteria to be allowed to perform accredited surveys on public roads. This report covers the 2019 trial run by TRL Limited, held on the Horiba-MIRA proving ground, September 24-25, 2019.]]></description>
      <pubDate>Tue, 12 Jul 2022 09:43:14 GMT</pubDate>
      <guid>https://trid.trb.org/View/1957516</guid>
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      <title>Benefits and Challenges Associated with the Implementation of Lean in Transportation Agencies</title>
      <link>https://trid.trb.org/View/1878817</link>
      <description><![CDATA[The highway construction industry constantly looks to increase productivity while public transportation agencies face challenges of shrinking budgets and staff numbers, even as the work continues to increase in size and demand. As a paradigm to maximize value and minimize waste with the resources available, Lean offers promise to enhance productivity, quality, and service. This study investigates the implementation of Lean by evaluating Lean conditions, practices, benefits, and challenges as expressed by U.S. and UK public transportation highway agencies as well as comparing the implementation of Lean between these agencies. Using a comprehensive literature review and formal interviews with six state departments of transportation along with Highways England from the UK, the findings show that Lean is intended to make process improvements to boost products and services to consumers. By creating a culture of continuous improvement, transportation agencies can improve their processes and increase their efficiencies and performance. Conversely, transportation agencies struggle to educate their employees and stakeholders in their understanding and practices of Lean, which causes confusion and ineffectiveness. Comparing the U.S. and UK transportation agencies, the approach to Lean implementation differs from a top-down approach for U.S. agencies to a bottom-up approach for Highways England. Furthermore, Highways England has an established tool for measuring Lean while development of quantifiable Lean measures is in its infancy in U.S. agencies. Overall, while the sample is limited, this exploratory study provides information for transportation agencies to use in consideration of implementing Lean.]]></description>
      <pubDate>Tue, 21 Sep 2021 16:00:06 GMT</pubDate>
      <guid>https://trid.trb.org/View/1878817</guid>
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      <title>Skid Resistance Benchmark Surveys 2020</title>
      <link>https://trid.trb.org/View/1855172</link>
      <description><![CDATA[Annual skid resistance surveys are performed by Highways England (HE) on its Strategic Road Network (SRN). The surveys are conducted during summer, divided into three periods (early, middle and late summer). Skid resistance varies annually and within each year, and the survey data are corrected by Local Equilibrium Correction Factors (LECF). HE established benchmark sites to monitor trends in levels of skid resistance. The sites are monitored during each survey period, and the collected data are examined for within-year and between-year trends in skid resistance levels. This TRL Limited report presents an analysis of the 2020 survey data, comparing the results to those from previous years.]]></description>
      <pubDate>Fri, 27 Aug 2021 14:54:09 GMT</pubDate>
      <guid>https://trid.trb.org/View/1855172</guid>
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      <title>Calculation of Local Equilibrium Correction Factors for the 2020 Skid Resistance Surveys</title>
      <link>https://trid.trb.org/View/1855171</link>
      <description><![CDATA[Skid resistance on England's Strategic Road Network (SRN) is managed by Highways England through annual surveys of skid resistance. The data is analyzed to identify sites where resurfacing might be needed to minimize the risk of skidding collisions. The data is also entered in the Key Performance Indicators (KPIs) for Pavement Condition. The surveys are adjusted for seasonal variation by the application of Local Equilibrium Correction Factors (LECF). The methodology for calculating the LECFs since 2007 was used again during 2020. This document provides a record of the procedure used to derive the LECFs that have been applied to the 2020 skid resistance survey data.]]></description>
      <pubDate>Fri, 27 Aug 2021 14:54:09 GMT</pubDate>
      <guid>https://trid.trb.org/View/1855171</guid>
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    <item>
      <title>A303 Stonehenge: Collaborative Design for a World Heritage Site</title>
      <link>https://trid.trb.org/View/1743189</link>
      <description><![CDATA[AECOM was commissioned by Highways England to design the upgrading of the A303 past Stonehenge from single carriageway to dual carriageway. Given its already iconic symbolism, the Stonehenge landscape has cemented its place in national and international popular cultures. This is a once-in-a-lifetime opportunity to deliver a project that solves the congestion problems and is respectful to the World Heritage Site (“WHS”). The design includes a twin bore tunnel to reunite the two halves of the WHS, allowing visitors to explore the historical landscape in a tranquil environment. Tunnelling beneath the ancient landscape has ignited diverse communities whose opinions range from advocacy to opposition; for some it’s welcome progression, for others it’s a sacrilegious intervention. The authors understanding of history permeates popular consciousness and the authors have international obligations to preserve such sites; the authors design achieves success in both the physical and the cultural landscape that could ultimately define the scheme as iconic. Designing and constructing a tunnel within a WHS has obvious technical and stakeholder challenges. The authors needed the design and construction to: maintain the Outstanding Universal Value of the WHS; not impact groundwater and the multiple borehole abstractions; not adversely affect the integrity of European Protected Sites (Special Areas of Conservation and Special Protection Areas); and integrate with the historic landscape. The authors sought input from key cultural heritage stakeholders, including Historic England, Wiltshire Council, The National Trust and English Heritage Trust to influence how the authors design developed and in order to sustain the Outstanding Universal Value of the WHS.The authors tunnel designers, archaeologists, geotechnical, ecology and landscape experts, and architect worked with these stakeholders in a collaborative environment to meet these exacting demands. Delivery focused on innovative technical and digital solutions; a 3D BIM model of the scheme, supplemented with auralisations and visualisations enabled heritage stakeholders to understand the impact of the scheme, then provide specialist input to minimising the effect on Outstanding Universal Value, thereby preserving the designation of the WHS. Such technologies were also used during public consultation events to obtain feedback from locals, businesses, tourists and the wider international heritage community on the proposed design.The authors design delivers the objectives of the project: - Economic Growth: Increasing productivity and boosting growth in the South-West. - Transport: Increased road capacity will deliver reduced congestion. - Cultural Heritage: Conserving and enhancing the WHS by permanently removing the existing road from much of the landscape. - Community: Reducing rat-running traffic in local villages, improving the quality of village life.]]></description>
      <pubDate>Wed, 03 Feb 2021 15:00:46 GMT</pubDate>
      <guid>https://trid.trb.org/View/1743189</guid>
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      <title>Improving Asset Management Capability by Changing the Delivery Approach</title>
      <link>https://trid.trb.org/View/1740617</link>
      <description><![CDATA[Highways England is responsible for the operation, management and maintenance of the strategic road network in England as a Government owned company. Improving our Asset Management capability is key to ensuring the authors can respond to increasing customer expectations and growing traffic volumes without increases in funding. Over the past 15 years, Highways England has increasingly outsourced network maintenance and renewal through 12 area-based contracts at a total cost of circa £850m per annum. The paper describes the move to a longer term, more effective, in-sourced approach to planning and delivery. This fundamental change of approach is being introduced incrementally and will be complete by 2022. The ‘Asset Delivery’ approach will allow Highways England to maintain the strategic roads asset in the same or better condition, whilst improving customer experience and creating efficiency and all with no additional funding The strategic case for a change of approach to Asset Delivery originated from key lessons learned from the previous delivery models. These models were predicated on Highways England passing responsibility for asset data, network stewardship, asset needs and programme development to single suppliers through relatively short duration contracts. Continuing in this way would have made delivery of an enhanced service increasingly challenging. The Asset Delivery approach sees Highways England take direct responsibility for asset intelligence and key decision making in respect of maintenance, operation and improvement of the road network. It also involves establishing a collaborative community based supply chain as opposed to the historic single supplier arrangements. Over the last two years the Asset Delivery approach has been rolled out across around 30% of the network. ‘Learn, Plan, Deliver’ is a key part of the Asset Delivery continuous improvement culture. Through the new arrangements and with the focus on improvement, the authors are delivering more for our funding with tangible gains in health and safety performance and customer experience. The authors are refreshing our asset data 50% quicker, have doubled the amount of pavement works with 70% higher volumes per scheme. The authors are completing an average of 23% more work per intervention reducing disruption to customers and minimising exposure of workforce. As knowledge of Asset Delivery increases, Highways England has shared its experiences with other highway operators and this paper aims to increase this further. The paper describes the case for change, the process, key lessons learned and the performance to date. It also provides the latest position with the implementation including future developments.]]></description>
      <pubDate>Thu, 31 Dec 2020 17:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/1740617</guid>
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