An amusing coincidence: the maximum allowed speed in Nicaragua is 50 km/h If This wasn't about to countries in America, I would suspect something technical behind those decisions. The only thing I can think of is the loss of energy efficiency when driving over 60km/h

As with everything, finding an official announcement of something in Nicaragua might be horrible, so have this instead https://ni.usembassy.gov/message-for-u-s-citizens-new-speed-...