I seem to remember seeing a car like that at an auto show when I was kid (I was in 6th grade when this film was made). I also remember the Chrysler corp. turbine cars of that era -- they did not last long as I recall.
Plus I remember the embedded wire concept of traffic controls -- The US DOT was experimenting with it in the early 1970s and maybe even later, before wireless technology and small computers were widely available and economical to consider.
Dating myself, I know...!