HiSPEQ7E: EQUIPMENT TO MEASURE TRAFFIC SPEED DEFLECTION

DESCRIPTION AND SPECIFICATION

NOTE: When completing this description and specification template please refer to the guidance notes provided in the Annex. Once the form is complete, delete the red text and the annex.

1 Summary of Equipment Name: Traffic Speed Deflectometer (TSD)

Manufacturer: Greenwood Engineering

TSD serial number:

2 DescriptionGeneral description of the equipment

3 Technical ability of equipment

Measurement of pavement deflection Comments

Number of Doppler lasers

Data rate of Doppler sensors

Raw data reporting interval

Where are measurements conducted?Location of measuring beam and sensors, respectively

Axle load is used during testing

For what purpose is longitudinal profile measured?

How is longitudinal profile measured?

To what accuracy is the longitudinal profile registered?

Driving speed during testing

Load registrations during testing

Temperature registrations during testing

Tyre pressure registrations during testing

Typical tyre/wheel configuration

Location measurement

How are measurements referenced to the network?

Additional, supplementary measuring systems

List additional sensor systems (video, GPR, Right-of-Way,…)

Data rate of additional systems

Raw data reporting interval

Processed data reporting interval

Combined use of deflection data and data from additional systems

Testing vehicle

Dimensions of testing vehicle

Specifications of tow truck

Survey requirements

Recommended testing conditions with regard to:Surface moisturePavement temperatureDriving speed

Does the equipment meet the above stated performance (data rate) when the pavement surface is wet or damp?If yes: How much present moisture is allowable to meet the stated performance? Please provide evidence of this.

Does the equipment meet the above stated performance (data rate) when the pavement surface temperature is outside the recommended range? When the pavement temperature at 40 mm depth is outside its range? Or when the air temperature is outside its range?If yes, please provide evidence of case where the stated performance has been met under temperature conditions outside

the recommended range.

Does the equipment meet the above stated performance (data rate) in any case, when the driving speed during testing is outside the recommended range?If yes, please provide evidence of such cases.

State any other survey condition (road geometry, traffic in neighbouring lanes,…), which would affect the stated performance of the equipment. Please elaborate on any example in this respect.

Parameters

List data delivered

List data analysis method(s)

Processed data reporting interval

Data format for processed data

4 Data formatThe standard and optional data formats delivered by the equipment – see guidance

5 Evidence of performance

Measurement of pavement deflection Comments

General tests

Formal Accreditation tests

Use in network surveys

6 Calibration regimesThe documented calibration process for the equipment – see guidance.

7 QA regimesThe documented QA processes for the equipment – see guidance.

8 Other Any further relevant information about the device.

HiSPEQ7E: EQUIPMENT FOR PAVEMENT DEFLECTION MEASUREMENT

GUIDANCE FOR COMPLETION OF THE DESCRIPTION AND SPECIFICATION TEMPLATE

1 Summary

1.1 Objective of this template

To efficiently manage their road networks road administrations rely on high quality condition data to understand the condition of the asset and plan and undertake maintenance programmes. High speed surveys have become a key source of this information. These surveys bring significant advantages to condition assessment, but they use different techniques and provide a wide range of different data types. When commissioning these surveys road administrations will typically develop a requirement specification defining the deliverables in relation to either the equipment and/or the measured data and the derived parameters. With the rapid developments in technology and the range of different systems available to provide this data, it has been recognised that there is a requirement for tools to assist those commissioning the surveys in understanding the equipment used for carrying out high-speed surveys.

The objective of the HiSPEQ equipment description template is to provide a method for road administrations to assess different types of equipment using a common description format that covers the same technical areas.

In parallel with the equipment description templates HiSPEQ has developed a template to assist road administrations to specify the survey data requirements. The survey specification templates list the types of data that a road administration may wish to collect on their networks and suggests ranges of accuracy and precision that would be desirable to achieve in a network survey. It is anticipated that road administrations would use these specification templates to assist them in defining the requirements for a survey regime on their network.

The equipment description template has been designed so that it can be used by road administrations to help them understand whether a proposed item of equipment would be capable of meeting the requirements listed in their survey specification. By having a common format for describing the equipment, with the same questions completed by each equipment provider, the equipment description template should help the administration understand and compare different types of equipment. This should simplify the selection process in comparison with comparing different styles of equipment descriptions provided by different contractors.

When completing the template please remember that the reader/user of the information may not be a technical expert in this area. The objective of the user is likely to be the development of a core level of understanding of the capability of the equipment in relation to the technical requirements listed.

1.2 Completing the summary section

In the summary section provide outline details of the equipment that would be used to provide traffic-speed pavement deflection information. As there is only one type of traffic speed deflectometer commercially available in Europe, the TSD, the serial number of the device should be given.

If you are completing the template as a reseller of the equipment, for example you are buying in a system and integrating this into a survey vehicle, then you should complete the question relating to the number of manufacturers in terms of the number of systems that your organisation has successfully provided and which have been used for use in routine surveys, not the number of items manufactured by the original equipment manufacturer.

A description of the vehicle on which the equipment is likely to be fixed would also be useful, for example, the make/model of vehicle or the type of vehicle (car, van, truck) and the approximate dimensions of the vehicle. This will enable the survey commissioner to determine whether the survey vehicle is appropriate, given any width or height restrictions on their network.

2 Completing the description sectionProvide a text description of the equipment that explains:

The general approach taken by the equipment to collect measurements. This should be written in a way that does not require a high level of technical pre-knowledge in the reader

Any particular strengths about the system (which can be demonstrated) Any particular limitations of the system (in relation to its application in network

surveys) Major assets of the specific device.

Please limit the length of this section to approximately 300 words.

3 Completing the technical ability of equipment sectionComplete the answers to the questions in the table. Where clarification is required to understand the response, provide this in the table in the comments column.

Measurement of pavement deflection Comments

Number of Doppler lasers Provide the number of sensors including reference sensor

Date rate of Doppler sensors Provide the data rate (maximum specified as well as practically experienced)

Raw data reporting interval Provide the reporting interval

Where are measurements conducted?Location of measuring beam and sensors, respectively

Wheel trackExplain – e.g. using a figure – where the measuring beam is located relative to the trailer and

the loading wheel.Provide the location of the different sensors on the measuring beam – and if relevant – in other places

Axle load during testing Specify the standard axle load used for testing

For what purpose is longitudinal profile measured?

Provide an explanation of the background for registration of the longitudinal profile. Is it for ‘real’ profile measurement or for control/adjustment of other TSD systems?

How is longitudinal profile measured? Is it measured according to HiSPEQ4?

To what accuracy is the longitudinal profile registered?

According to EN-13036-6:2008?

Driving speed during testing Provide the driving speed used for routine tests. What is the allowable speed for the type of tow truck used? Is constant velocity desirable? Is cruise control applied?

Load registrations during testing Are static and dynamic loads registered continuously during testing? How and where – please explain.

Temperature registrations during testing Which temperature parameters are registered during testing? Are they monitored continuously? Location of temperature gauges – which type(s)?In case of estimation of pavement temperature: how is this done?

Tyre pressure registrations during testing Is tyre pressure (and tyre temperature) monitored continuously during testing? How and where – please explain.

Typical tyre/wheel configuration Is there a place for registration of tyre/wheel configuration – and degree of tyre wear? How and where – please explain.

Location measurement

How are measurements referenced to the network?

Is this according to HiSPEQ2, or other method? Please explain.

Additional, supplementary measuring systems

List additional sensor systems (video, GPR, Right-of-Way,…)

Provide a list of additional sensor systems – plus a short description of each.

Data rate of additional systems Provide data rate(s)

Raw data reporting interval Provide the reporting interval(s)

Processed data reporting interval Provide the reporting interval(s). Can the reporting interval be limited depending on acceptance criteria for, e.g., driving speed and data rate?

Combined use of deflection data and data from additional systems

Is there any combination of results from different measuring systems (e.g. TSD and GPR,…). Explain purpose and output.

Testing vehicle

Dimensions of testing vehicle Provide length, height and width of tow truck and trailer. Also, provide all wheel and axle loads.

Specifications of tow truck Provide engine capabilities, emission levels, maximum driving speeds, cruise control, left/right hand steering.

Survey requirements

Recommended testing conditions with regard to:Surface moisturePavement temperatureDriving speed

Provide the recommended ranges for optimum testing conditions.

Does the equipment meet the above stated performance (data rate) when the pavement surface is wet or damp?If yes: How much present moisture is allowable to meet the stated performance? Please provide evidence of this.

When is the pavement surface too wet to be tested? – Are there any exceptions from the general rule?

Does the equipment meet the above stated performance (data rate) when the pavement surface temperature is outside the recommended range? When the pavement temperature at a depth 1/3 to ½ of the total asphalt thickness is outside its range? Or when the air temperature is outside its range?If yes, please provide evidence of case where the stated performance has been met under temperature conditions outside the recommended range.

When is the pavement too warm or too cold for testing? – Are there any exceptions from the general rule? Are the TSD data valid when obtained at temperatures outside the recommended range?Correction of data to a standard temperature?

Does the equipment meet the above stated performance (data rate) in any case, when the driving speed during testing is outside the recommended range?If yes, please provide evidence of such cases.

What are the likely consequences of driving faster or slower the recommended speed range? What is the likely consequence of driving with a varying speed during testing?Correction of data to a standard

speed?

State any other survey condition (road geometry, traffic in neighbouring lanes,…), which would affect the stated performance of the equipment. Please elaborate on any example in this respect.

Should testing data obtained in sharp curves or when heavy trucks pass the TSD during testing be discarded?

Parameters

List data delivered Provide a list of primary pavement parameters and indices delivered, e.g.,Deflection velocityDeflection slopeAbsolute deflectionSurface Curvature IndexBase Distress Index

List data analysis method(s) Provide a list of the methods used to analyse raw data and convert them into pavement parameters, likeBeam modelAbsolute deflection modelAustralian AUTC model

Processed data reporting interval Provide the reporting interval

Data format for processed data Provide formats offered, e.g. comma separated, f25 format

4 Completing the data formats sectionDescribe the standard data formats delivered by the device and the options for customised data formats.

5 Completing the evidence of performance sectionThis section is included so that evidence can be provided to support the performance claims stated in the above table. Provide answers for each item of equipment.

In case of both measured data and derived parameters, please provide answers for each of these separately, as appropriate:

Measurement Comments

General tests

Describe the results of any formal tests that have been carried out to test and demonstrate the performance of the equipment under conditions such as those that will be encountered in network surveys.For measured and derived parameters as appropriate.

Formal Accreditation tests

If specific accreditation tests have been carried out on the equipment state the performance requirements that have been tested against and the performance achieved.Have tests against international standards been carried out? Which standards (provide a reference) and what is the performance?For measured and derived parameters as appropriate.

Use in network surveys Summarise any network survey contracts in which the system has been used, including the lengths surveyed.

6 Completing the calibration regimes sectionSummarise the required calibration regimes for the equipment. This should describe any processes required to ensure that the equipment is able to meet the above stated performance figures. Are different regimes required for “major” and “minor” calibrations? How frequently is calibration required?

State these for each item of equipment.

7 Completing the QA regimes sectionThis section is focussed on the quality assurance of the equipment itself, and tests applied on the equipment. This section is not referring to QA certification of the contractor or manufacturer.

Describe the processes that are recommended for testing (accreditation / validation) and quality assurance of the equipment.

What QA systems and procedures are built into the equipment to facilitate ongoing compliance with the performance requirements?

This might for example include hardware or software tools that enable the operator to carry out day-to-day checks. Describe these.

There may be tests for the equipment as a whole and for individual components. If so explain both these tests.

8 Other Present here any other information about the equipment, which you consider to be of relevance to understanding the equipment and its performance.

Include links to freely available relevant documents.

This specification was developed by the HiSPEQ project, the research for which was carried out as part of the CEDR Transnational Road Research Programme Call 2013. The funding for the research was provided by the national road administrations of Denmark, Germany, Ireland, Netherlands, UK and Slovenia.