Its unlikely you’ll change your plans because of the number of unpaved roads a country has, or how crowded they’re likely to be, but some statistical information may help you form an opinion of what driving conditions will be like in the country you’re visiting.
Left Hand/Right Hand Driving
Most Remote Car Rental Companies
Worlds Busiest Roads
Worlds Worst Roads
Most Dangerous/Safest Roads
World Fuel Prices
Drink Driving Limits