Award Date


Degree Type


Degree Name

Master of Science (MS)


Civil and Environmental Engineering

First Committee Member

David James

Number of Pages



The overall goal for this thesis is to develop a representative local data set for amount and distribution of vehicle starts and soaks for Southern Nevada metropolitan area. These valid local start/soak values will be used to create input files for the MOBILE6.2 emissions model and will also be analyzed in comparison to EPA default values. A four month 349-sensor study of starts behavior in metropolitan Southern Nevada produced, compared with EPA default values, fewer weekday starts for cars (5.5 vs. 7.3) and trucks (5.5 vs. 8.1) and fewer weekend starts for trucks (4.7 vs. 5.7). Las Vegas drivers exhibited earlier morning peak starts and later afternoon peak starts than EPA default values. Las Vegas had more short trips (<10 minutes) and lower proportions of medium trips (21-40 minutes) and long trips (41-50+ minutes) than EPA default values. Las Vegas had a lower proportion of hot soaks of any duration than EPA defaults. Las Vegas also showed a lower proportion of all diurnal soaks and short diurnal soaks, and a higher proportion of long diurnal soaks (24-71 hours) than EPA defaults.


Engine; Frequencies; Nevada; Soaks; Southern; Starts

Controlled Subject

Civil engineering; Environmental engineering

File Format


File Size

2754.56 KB

Degree Grantor

University of Nevada, Las Vegas




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