2. Method
2.1 Sample
A total of 2542 observations were made of motorcyclists on public roadways in the City
of Mar del Plata, Argentina. These observations took place between June and November, 2012.
They were made in nine different locations in the city. At each location, data were reported over
the course of an hour-long observation during one weekday (day and night) and one weekend
day (day and night).