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After-the-fact monitoring systems are being used to check up on motor-fleet drivers as well as teenagers, and experts say it won't be long before real-time monitors show up as well.
The government is warning owners of Toyota and Lexus vehicles about safety problems tied to removable floor mats.
They say the mats could interfere with the vehicle's accelerator and cause a crash.
The Transportation Department says owners should take out the floor mats on the driver's side and not replace them.
A large vehicle recall is expected later Tuesday.
Toyota did not immediately comment on the warning.
The consumer alert affects these model year vehicles:
2007-2010 Toyota Camry
2005-2010 Toyota Avalon
2004-2009 Toyota Prius
2005-2010 Tacoma
2007-2010 Toyota Tundra
2007-2010 Lexus ES350
2006-2010 Lexus IS250 and IS350