Bratislava is well-known for its bad roads. Potholes, cheap asphalt, pools of water slowly evaporating after the rains.
As I am a cyclist I have been thinking about how to cheaply evaluate road quality here.
And my idea is this cheap DIY solution:
You will need a mobile phone (or any other sound recorder) and a GPS logger. Sound (or rather noise) recorder will be recording “bumps” – noisy parts of the road – and a GPS logger will help you synchronize noise with location.
Sound recorder should be placed inside a plastic box, where it will freely move (and jump if road quality worsens).
Road quality evaluation – recorded waverform / noise example:
After matching noise recording with GPS log, you can create a road quality heatmap such as this:
Strong noise translates into red and means road of very bad quality. Quiet recording or no noise translates to green and means road of very good quality with smooth surface. An average bumpy road is orange.