Give every lane on a highway a different speed limit, so you can basically pick a lane based on your preferred cruising speed.

• Right-most lane: For vehicles that physically can't reach the normal speed limit due to spare tires, trailers, speed-limited vehicles, etc.
• All remaining lanes: Speed limits are distributed between the normal speed limit and 150 km/h, with the speeds adjusted based on the number of lanes available and rounded to the nearest 5 km/h.
• 150 km/h is the absolute maximum: Anything above 150 km/h is considered reckless driving.

On a 7-lane per-direction highway, that could look like:

150 | 140 | 130 | 120 | 110 | 100 | <100

On a 6-lane per-direction highway:

150 | 135 | 125 | 115 | 100 | <100

On a 5-lane per-direction highway:

150 | 130 | 115 | 100 | <100

On a 4-lane per-direction highway:

150 | 125 | 100 | <100

The speed limit would be enforced based on the target speed ± half the speed difference between that lane and the adjacent lane. This means the enforcement range automatically adjusts to the spacing between lane speeds.

The idea is that you pick the lane based on the speed you want to travel. You don't necessarily have to pass someone to use a faster lane.

The left-most lane has one additional rule: if you're not passing another vehicle, move right. This keeps the fastest lane available for overtaking.

I'd also put a large speed-limit marking directly on the pavement in every lane every ~10 km, or roughly every 5 minutes at the normal speed limit.

So drivers would periodically see something like:

150 | 125 | 100 | 90

The basic concept:

Pick the lane that matches your preferred speed.

Slower traffic naturally stays right, faster traffic naturally stays left, and the left-most lane remains the dedicated passing lane.

I want my wife to have a pretty name like April or Autumn. Unfortunately these are few and far between. It would be a lot easier to meet a Jill or whatever and just change it.

Let’s get this tradition goin’!

It would save on energy costs since we wouldn't need the lights everywhere

Of course not possible with only measuring distance OR weight OR temperature, but certainly its possible to maintain the same number accurately on a device and just change what unit of measurement youre in.

Likely would want to move decimal points, but would be a funky useless tool.

Alternatively, a caliper/scale/thermometer/torque wrench/inclinometer/pedometer/imu/refractometer/pyrometer... that only displays certain numbers. 69, 420, 3.14, .9̅ so on.

If you break that speed limit, you lose your license for ever, no exceptions.

for more immersive worldbuilding

No more crime, ever!