In New York City, travel time and cost more strongly predict social media connectedness than geographical distance, according to a recent working paper from the National Bureau of Economic Research.

American road engineers are using temperature models that do not consider the warming climate, costing the country billions in early repairs, a new study finds.

Police officers speak less respectfully to black drivers than white drivers during routine traffic stops, according to a new study from Stanford University researchers.

A new study suggests that laws allowing police to directly cite motorists for not wearing seat belts may be less effective than they once were at reducing accident deaths.

Airplanes are now the largest source of lead pollution in the United States. Americans hurt by lead exposure may be losing billions in lost wages.

2016 study published in PNAS that looks at the impact of night-shift work on measures of drowsiness, driving performance and risk for motor vehicle crashes.