As e-commerce continues to reshape urban life, city streets are under growing pressure. Every online order ends with a delivery truck searching for somewhere to stop. A new study published in Transportation Research Interdisciplinary Perspectives offers a rare look at that moment from the driver’s seat.
Researchers from Oregon State University and the University of Washington used a heavy-vehicle driving simulator to observe how 33 commercial truck drivers made real-time parking decisions across 24 urban scenarios. By combining speed tracking, eye-tracking glasses, and post-drive surveys, the team captured something traditional field studies rarely can: controlled, measurable driver behavior in realistic conditions.
What scenarios were tested
Each simulated street varied in four factors: road width (2 or 4 lanes), the presence or absence of a bike lane, whether passenger-car parking spaces were available, and the status of a Commercial Vehicle Loading Zone (CVLZ) — available, occupied, or absent.
The findings are striking
When a CVLZ was available, drivers slowed down, parked legally, and moved on. But when that space was occupied or simply didn’t exist, the picture changed dramatically. Around 60% of drivers chose to park illegally (in bike lanes, travel lanes, or passenger car spaces) rather than circle the block. Only about 20% kept searching for a legal spot.
Eye-tracking data reinforced the story. Drivers spent significantly more time fixating on pavement markings when a CVLZ was occupied, suggesting frustration and cognitive load as they searched for alternatives. Higher speeds in occupied and unoccupied zones indicated that drivers were giving up the search and pressing on.
The post-drive survey added texture: 38% of drivers reported feeling uncomfortable while searching for designated zones. More than 80% advocated for exclusive truck parking at the curbside. In real life, over 30% admitted to regularly parking in no-parking zones.
What this means for cities
The research points to a simple but underappreciated reality: illegal parking by delivery drivers is largely a supply problem, not a behavior problem. When legal space exists, drivers use it.
The authors recommend expanding CVLZ provision, improving signage, introducing scheduled delivery time windows, and designing buffered bike lanes to reduce conflicts when trucks must stop nearby. They also flag the economic dimension — large carriers often absorb parking fines as a business cost, while small operators cannot, suggesting differentiated enforcement may be worth exploring.
As urban freight demand continues to rise, this study makes a clear case: giving delivery drivers a legal place to stop is one of the most practical investments a city can make.