Providing effective roadside warning devices for drivers of large trucks is critical on freeway connectors where speeds are relatively high but design speeds may be substantially lower than on mainlanes. Identifying and testing appropriate methods of monitoring traffic on freeway connectors was included on an earlier phase of this research. Two monitoring systems evolved, one using roadway sensors and the other using roadside sensors. Roadway sensors consisted of both piezoelectric and inductive sensors, while roadside sensors applied infrared sensor technology. The roadway warning devices tested can be categorized as passive devices and active devices. Passive devices consisted of 'truck tipping' warning signs, while the active device consisted of flashing lights mounted one above and one below a set of passive truck tipping signs on both sides of the roadway. Speed reduction, as associated with accident reduction, was the ultimate goal of these tests.The null hypothesis tested by ANOVA of no treatment effect in the presence of inital speed was rejected in all but one of four models, using the probability of a Type I error, alpha, equal 0.05. Speed reductions due to the active system were significant downstream of the first curve on the connector, suggesting that truck drivers reduced speeds due to the lights, but beyond the desired location. Cumulative speed distributions showed that the fastest trucks decreased their speeds by approximately 3 to 5 km/h (2 to 3 mi/h) during the test period.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Study of Selected Warning Devices for Reducing Truck Speeds


    Beteiligte:
    D. Middleton (Autor:in)

    Erscheinungsdatum :

    1994


    Format / Umfang :

    155 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Warning Devices for Reducing Speeds on Curves

    Stamatiadis, N. / Vest, A. / Beijing jiao tong da xue; Guo jia zi ran ke xue ji jin wei yuan hui (China); Wang Kuancheng jiao yu ji jin hui | British Library Conference Proceedings | 2006


    Reducing Runaway Truck Accidents through Weight-Based Advisory Speeds

    M. Firestine / D. Cunningham / H. McGee | NTIS | 1989


    Uphill truck speeds

    Willey, W.E. | Engineering Index Backfile | 1950


    Devices for reducing landing speeds

    Berger, P. | Engineering Index Backfile | 1930


    Truck Speeds in Virginia

    W. S. Ferguson | NTIS | 1968