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- W600114816 abstract "In recent years there has been an explosion in the use of electronic data loggers for measuring vehicle speeds. However, there are a number of sources of error which will affect the accuracy of the results and many users do not allow for these when reporting their data or conclusions. These errors are principally introduced through the accuracy of the timing mechanism in the recording device and by not accurately measuring the distance between detectors. This paper considers these errors with particular reference to the ARRB VDAS data logger. However, the principles apply equally to other traffic recording devices. The paper presents tables and graphs of the maximum speed errors (km/h) and axle lengths (m) from timing and detector measurement errors as a function of vehicle speed. On the basis of these errors, recommendations are made concerning the most appropriate spacing for detectors.The paper also considers the errors in speed surveys in relation to the sample size. A technique is presented for using the error limits to determine the sample sizes required for statistically significant results. (A) For the covering entry of this conference, see IRRD abstract no. 843369." @default.
- W600114816 created "2016-06-24" @default.
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- W600114816 date "1992-01-01" @default.
- W600114816 modified "2023-09-27" @default.
- W600114816 title "ERROR CONSIDERATIONS IN UNDERTAKING VEHICLE SPEED SURVEYS" @default.
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