Senator ask safety agency to answer Toyota acceleration questions. Michael Martinez, CNN. Thur July 12 2012 Senator asks safety agency to answer Toyota acceleration questions - CNN.com News summary: US Senator Chuck Grassley (R-IA) asked David Strickland of the National Highway Transportation Safety Administration (NHTSA) to reopen its previous investigation on safety of Toyota vehicle with respect to unintendent acceleration. The senator bases his concerns on what appears to be secret / confidential Toyota prototype engineering/ testing documents of Toyota's adaptive cruise control (? via industrial espionage? )- Grassley says that these documents suggest possible acceleration problems occured during the early development of the Lexus 460 and with the Toyota Tundra. Toyota claims that Grassley has mistranslated these technical prototype testing documents which are in Japanese and that those documents says no such thing. While there is no evidence that any Toyota vehicle has a "tin whisker" electronic circuitry problem, Grassley argues that the previous NTHSA investigation was incomplete and flawed and ask NHTSA to reinvestigate this issue again.