Speed light on dash: what's it for?

[Shorts]

On divided national highways, the speed limit is 100kph just like here. Not sure why it comes on at 90kph, the next lowest speed limit is 60kph.

The toll road from Aomori to Tokyo is all 70-80kph for 9hrs straight. Many people drive 100+. In the cities, the normal speed is 40kph.

Not all cars or bikes have the speed warning light. My truck does not, my bike does not. However, there are moels the same as mine that do have the warning light. The vans we rent also do not have the speed light. We sat at 130kph for liberal amounts of time and no beep.

[xwhatsit]

The toll road from Aomori to Tokyo is all 70-80kph for 9hrs straight. Many people drive 100+. In the cities, the normal speed is 40kph.

Not all cars or bikes have the speed warning light. My truck does not, my bike does not. However, there are moels the same as mine that do have the warning light. The vans we rent also do not have the speed light. We sat at 130kph for liberal amounts of time and no beep.

Oh, sorry, that's just what a friend over there told me. She lives up in Sapporo though so maybe a different system.

It's odd, because the speed lights are obviously not legislated or required, because of the different speeds they come on and how not all vehicles have them, like you said. But why include them mainly in Japanese domestic models, not ones they export (usually)?

[Shorts]

Oh, sorry, that's just what a friend over there told me. She lives up in Sapporo though so maybe a different system.

It's odd, because the speed lights are obviously not legislated or required, because of the different speeds they come on and how not all vehicles have them, like you said. But why include them mainly in Japanese domestic models, not ones they export (usually)?

I'm not really sure of the rhyme or reason as to when the auto manf install these speed warning lights. It is not based on the year model as I know both older and newer model vehicles have it. I'm not sure what makes them decide to install them.

Then again, JPN is based on the honor system for society. Mainly that "you'll do the right lawful thing" without needing to be enforced, but instead simple reminders.

It should be relatively easy to disablethe speed warning light. 1) put in a dead bulb or 2) disconnect the system all together.