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Anita Sari
Civil Engineering Department Tarumanagara University,
Transportation

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SAMPLING STRATEGY FOR SPACE MEAN SPEED SURVEY Leksmono Suryo Putranto; Anita Sari; Bernadus Ivan Santoso
Jurnal Transportasi Vol. 12 No. 3 (2012)
Publisher : Forum Studi Transportasi antar Perguruan Tinggi (FSTPT)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (365.105 KB) | DOI: 10.26593/jtrans.v12i3.501.%p

Abstract

In most traffic projects, speed survey is required. If the speed survey uses detector, all data might be obtained. Otherwise a sampling strategy needs to be introduced. To ensure the collection of representative sample of speeds there were several sampling options, e.g. collecting sample every regular interval. In this paper three regular intervals were tested, i.e. 30 seconds, 1 minute and 2 minutes 30 seconds. Travel time data was collected in morning, mid day, and afternoon periods in a two-lanes two-ways underpass in Jakarta. Travel speeds were calculated by dividing light vehicle travel times with the underpass length. Space mean speeds were calculated as a light vehicle travel mean speeds/ 5 minutes. The observation of each light vehicle travel times (to get each light vehicle travel speeds) was conducted for the first 15 minutes of three observation periods. More frequent speed sample collection provides higher accuracy.Keywords: space mean speed, sampling strategy, regular interval sampling
Co-Authors Bernadus Ivan Santoso Leksmono Suryo Putranto