It beggars belief that Uber would only deploy driverless cars at peak times. If the company is investing in expensive automated cars, which also give it more profit than a regular driver-type vehicle, why not use them 24/7?
If you seem nervous, or if you seem unusually calm. If you're sweating (even on a hot day). These 'clues' might cause the TSA to suspect you're a terrorist. The TSA is unable to justify its program, which has been both costly and utterly a failure.