Singapore may be small, but within that space (a bit over 700 square km) it has everything larger countries have. Towns, expressways, nature reserves, military bases, airports, etc.

Thus, it is an excellent place for testing such things as self driving cars.

The amount of miles driven per year on highway, which is the issue I'm addressing, is much too low. Just need higher throughput.

I found this statistic[1] from LTA, and as far as I can tell, there are 10 billion km travelled on cars per year in Singapore.

I don't know how that compares to other countries though.

[1] https://www.lta.gov.sg/content/dam/ltaweb/corp/PublicationsR...

Five trillion km/year in the US.