ASTM E2532-09(2024)

Podrobné informácie

Označenie: ASTM E2532-09(2024)

Dátum vydania: 01.05.2024

Stránok: 14

Krajina: Americká technická norma

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Anotácia

These test methods define two categories of acceptance tests for evaluating the performance of highway traffic monitoring devices (TMD) according to the functions it performs, the data it provides, the required accuracy of the data, and the conditions under which the device operates. The tests are performed in a field environment and result in an accept or reject decision for the TMD under analysis. The first test is the Type-approval Test intended for TMDs that have never been type approved, and verifies the functionality of all features of the TMD by providing information for evaluating the accuracy of the data item outputs when monitoring vehicle flows consisting of a mix of all anticipated vehicle classes under a specified range of operating conditions. The second, the On-site Verification Test, is applicable to production versions of TMDs that have previously passed a Type-approval Test, but are now being installed at a new location or have been repaired. Lighting and weather factors that may be included as part of TMD testing are (1) dawn ambient lighting, (2) dusk ambient lighting, (3) nighttime ambient lighting, (4) sun glint, (5) rain characterized by rain rate, (6) fog or dust characterized by human visual range, and (7) snow characterized by snow fall rate and snow flake size.


Keywords:
correct detection, data item, false detection, incident detection, interaxle spacing, lane occupancy, missed detection, test methods, traffic monitoring device, vehicle classification, vehicle counter, vehicle critical dimension, vehicle detector, vehicle flow parameter measurement, vehicle flow rates, vehicle passage, vehicle presence, vehicle sensor, vehicle speed, vehicle-to-vehicle gap,, ICS Number Code 03.220.20 (Road transport)