Det er en ulempe at elkøretøjer ikke støjer så meget, da fodgængere og cyklister så skal være ekstra påpasselige i trafikken.
- University of California, Riverside (2008, May 1). Hybrid Cars Are Harder To Hear: May Pose Greater Risks For Pedestrians. ScienceDaily. Retrieved May 2, 2008 Citat: "...“There is a real difference between the audibility of hybrid vehicles and those with traditional internal combustion engines that could have effects on the safety of pedestrians, which needs to be studied,” Rosenblum said...This research provides evidence that hybrid cars, when operating in silent mode, pose a substantial risk to blind people and other pedestrians...Only a subtle sound enhancement should be required — maybe something like the simulated sound of a very quiet engine..."