Single-occupancy vehicles are one of the air pollution factors.
Single-occupancy vehicle trips (/commute trips) are one of the air pollution factors.
A single-occupancy vehicle (SOV) is a privately operated vehicle whose only occupant is the driver. The drivers of SOVs use their vehicles primarily for personal travel, daily commuting and for running errands.
Example: Does anyone know of any effective research studies which have been conducted on psychological motivations for the single occupancy vehicle commute?... In alternatives, it takes a complex, multi-layered, technology-intensive solution to replicate the convenience, flexibility, and simplicity that is taken for granted when driving alone.