Journal of Advanced Transportation / 2018 / Article / Tab 1

Research Article

Random Forests-Based Operational Status Perception Model in Extra-Long Highway Tunnels with Longitudinal Ventilation: A Case Study in China

Table 1

Monitoring instruments and data.

Data categoryData nameInstrument and model UnitStatistical interval

Ambient airCOThermoFisher Model 48i CO Analyzerppm15-min average value
NO2ThermoFisher Model 42i Analyzerppm
Air velocityAZ Instrument 9871m/s
PM2.5ThermoFisher Model 5030i Particulate Monitormg/m3

Traffic flowPCLaser vehicle detectorvehicle/15 min15-min accumulative value
LDVvehicle/15 min
HGVvehicle/15 min

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