Toyota Motors Inc. had the opportunity to install software to prevent sudden acceleration in their cars in 2007, and yet only began doing so in January of this year after a 2009 accident in San Diego left four dead. The Los Angeles Times reported than in 2007, federal regulators asked Toyota to install the software after receiving complaints about unexpected acceleration. Documents show that regulators pushed Toyota to install the software, and that a year before the crash, Toyota officials ordered an internal investigation regarding the acceleration. Legislators said the documents raise questions as to whether Toyota is taking proper steps to fully eliminate the dangerous acceleration.