A web app visualizing the distances recommended by various public health officials. Sources:

• World Health Organization
• European Centre for Disease Prevention and Control
• Centers for Disease Control and Prevention
• Bundesministerium für Gesundheit
• Health Canada
• New Zealand Ministry of Health
• Australian Government, Department of Health
• NHS
• • From 4 July the 2m social distancing guidance will change to a distance of "one metre plus" in England.

Object measurements reference:

• Dimensions.com
• Bike Gremlin
• Designer’s guide to COVID-19: Physical distancing, by Raimana Jones
• Wikipedia: Standard-gauge railway