Each individual driver is not entirelly self-contained in their motivations and the way they drive, with no influence from what happens to other drivers around them.

Privacy and road safety are definitelly linked, because there is a systemic effects to more effective enforcement of driving rules, both because drivers fear getting caught a lot more (because they know somebody who knows somebody who got caugh) and because people tend to drive like those around them (it’s one thing to be the rule breaker amongst widespread rule breaking, it’s another being the rule breaker amongst widespread rule compliance).

Now, privacy lowered for the sake of something other than enforcing the rules (or if there is an alternative way of achieving the same that does not break people’s privacy), that’s a whole different thing, but if the reason is to catch rule-breakers it will most definitelly lead to lives saved because there will be people who now drive within the rules because they fear getting caught who would otherwise have driven in ways that endanger others.

To quote you: “You need to give it a bit more thought.”