The first cities we studied were:
Barcelona (
Spain),
Budapest (
Hungary),
Lisbon (
Portugal),
London (
UK),
Milan (
Italy),
Munich (
Germany),
Oslo (
Norway),
Prague (
Czech Republic), and
Krakow (
Poland). We found a driver in each city to take part in our research.
We collected data on each driver's resting and driving heart rate, and measured the highest and lowest bpm for both situations. Then we found the mean of their lowest resting and driving heart rates. We deducted this from the mean of their highest heart rates, resting and driving. We showed the heart rate data to Dr Adedeji Saheed, a practising medical doctor specializing in internal medicine, with over three years of clinical practice. He provided an insight into typical heart rates.
The resulting numbers were used to create the ranking, with those drivers with a significant difference between their average high and average low considered to be experiencing a higher level of stress. From now on we will refer to this number as their 'Stress Rating'.
We also drew on information from online platforms such as Reddit and forums for travel, driving and motorcyclists to see what people are saying about road conditions, parking and what it is like to drive in each of these cities.