Zobrazeno 1 - 10
of 78
pro vyhledávání: '"Helmut T. Zwahlen"'
Publikováno v:
Transportation Research Record: Journal of the Transportation Research Board. 1999:131-140
Headway or interarrival time (IAT) data of successive vehicles in free-flowing traffic ahead of work zones for each lane on six different Ohio freeways (two with two lanes in one direction, three with three lanes, and one with four lanes) for 3 days
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3f0069927353ad2f8db8a822324a17a9
https://doi.org/10.3141/1999-14
https://doi.org/10.3141/1999-14
Publikováno v:
Transportation Research Record: Journal of the Transportation Research Board. 1917:127-140
A trailer using two Wavetronix microwave radar units in side-fire mode was developed to measure traffic nonintrusively, including time-stamped arrival records, moving average speed ( N = 16), length, and classification (0 to 20 ft, 20 to 40 ft, more
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ac031e26322727221e6388ba8dda7d6a
https://doi.org/10.1177/0361198105191700115
https://doi.org/10.1177/0361198105191700115
Publikováno v:
Transportation Research Record: Journal of the Transportation Research Board. 1877:17-25
A group relamping model was developed and evaluated by using bulb-replacement records from the Ohio Department of Transportation (ODOT) District 4 as a test case for a limited sensitivity analysis. The relatively easy-to-use Excel spreadsheet compute
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7a20fd6904b10c104739c843fb49ece5
https://doi.org/10.3141/1877-03
https://doi.org/10.3141/1877-03
Publikováno v:
Transportation Research Record: Journal of the Transportation Research Board. 1843:61-69
The driver eye scanning study is part of a larger study conducted for the Ohio Department of Transportation to evaluate the effectiveness of ground-mounted diagrammatic guide signs placed before entrance ramps at highway freeway interchanges. This ni
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7771d3edaa3e340b12a66840636b722c
https://doi.org/10.3141/1843-08
https://doi.org/10.3141/1843-08
Publikováno v:
Transportation Research Record: Journal of the Transportation Research Board. 1843:70-80
This study investigated the effectiveness of ground-mounted diagrammatic signs in the context of urban multilane arterials leading to freeways. Six highway-freeway interchanges were selected in the greater Columbus, Ohio, area for installation of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bf46407bf97b389a5f99ac1d039a063b
https://doi.org/10.3141/1843-09
https://doi.org/10.3141/1843-09
Autor:
Helmut T. Zwahlen, Andrew Russ
Publikováno v:
Transportation Research Record: Journal of the Transportation Research Board. 1803:87-93
The accuracy of the travel times displayed by the real-time Travel Time Prediction System (TIPS) in a construction work zone was investigated. The TIPS includes changeable message signs (CMSs) displaying the travel time and distance to the end of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a9a25837eb23136a9d9e243070eb90d6
https://doi.org/10.3141/1803-12
https://doi.org/10.3141/1803-12
Publikováno v:
Transportation Research Record: Journal of the Transportation Research Board. 1754:57-67
Computer models like CARVE (Computer Aided Roadmarking Visibility Evaluator), which predict the nighttime visibility of pavement markings, require quantitative information about the coefficient of retroreflected luminance RL for selected pavement mar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::07ed3e7be93a639c6fc6782e36713334
https://doi.org/10.3141/1754-07
https://doi.org/10.3141/1754-07
Autor:
Thomas Schnell, Helmut T. Zwahlen
Publikováno v:
Transportation Research Record: Journal of the Transportation Research Board. 1708:47-60
The Federal Highway Administration was mandated by the U.S. Congress to establish in-service levels of minimum pavement-marking retroreflectivity and commissioned research to determine the minimum in-service level from a driver’s point of view. Com
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::012371288e202315c918c772d6af5e7a
https://doi.org/10.3141/1708-06
https://doi.org/10.3141/1708-06
Autor:
Thomas Schnell, Helmut T. Zwahlen
Publikováno v:
Transportation Research Record: Journal of the Transportation Research Board. 1715:60-70
Minimum in-service retroreflectivity values for pavement markings are presented based on visibility computations performed with the CARVE (Computer-Aided Road-Marking Visibility Evaluator) computer model. CARVE accurately computes all geometric and p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::757a323d91a2ec435fc87f7b573e4760
https://doi.org/10.3141/1715-09
https://doi.org/10.3141/1715-09
Autor:
Thomas Schnell, Helmut T. Zwahlen
Publikováno v:
Proceedings of the Human Factors and Ergonomics Society Annual Meeting. 43:1367-1371
The human threshold contrast of circular targets has been thoroughly studied by Blackwell and his data has been used in a number of visibility prediction models. These models either assumed the difference in visibility between circular and non-circul
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::df92087d6e4aecfb4fbb0f7dbcfc9087
https://doi.org/10.1177/154193129904302322
https://doi.org/10.1177/154193129904302322