Dangerous intersections, they won't worry about. BUT a blanket 15 MPH and 20 MPH speed limit they pass without a blink of an eyelash! A much bigger revenue raiser for the local cops and county!! Its politics, follow the money stream and you will get your answer as to how fast changes will be made..
Case in point: Delmar & Rio Grande intersection. They seem to have a car accident there every three months or so, but for over 16 years they have been "studying " the need for a 4 way stop. Maybe this July it may come to pass.
A nice safety issue, but not much income unless a cop sits there all day watching for rolling stops, or whatever. Also the forced stop on Rio Grande will slow speeds down and ruin a good speed trap area.