Lyimo Sia

• Western Michigan University

Persons with disabilities have difficulties traveling from one point to the other due to the limited options of travel modes for the first and last mile. Western Michigan University tested using an autonomous shuttle on the main campus's sidewalks for persons with disabilities. This study's objectives are to understand the empathy college students...

The highway capacity manual (HCM) provides a formula to calculate the heavy vehicle adjustment factor (fHV) as a function of passenger car equivalent factors for the heavy vehicle (ET). However, a significant drawback is that the methodology was established solely based on human-driven passenger cars (HDPC) and human-driven heavy vehicles (HDHV). D...

The surge of crowdsourced cycling data from various fitness tracker apps has attracted the attention of transportation planners as it has the potential to provide rapid, cheaper, and high-resolution data for the planning of cycle infrastructure. However, much has been asked on whether the data coming from these fitness tracker apps represent the de...

Establishing comparison events/crashes is among the key challenges in safety analysis. This study proposes a spatial consideration for predicting scooter crashes using Utah's five years of crash data. It involves creating buffers ranging from 5 to 250 ft from the point of the scooter crash to obtain comparison crashes. The appropriate variables wer...

This study used a time-varying Markov chain (TMC) assumption to develop an empirical probabilistic model that evaluates the influence of rainy weather and traffic volume on the dynamic transition of traffic conditions. The 2015 traffic and precipitation data for the I-295 freeway in Jacksonville, Florida, were used in the analysis. Using the Gaussi...