On Fri, 12 Feb 2016 20:30:18 -0700, rbowman
wrote:

On 02/12/2016 12:46 PM, Ed Pawlowski wrote:
I think you are correct, but lights are not just to see. They are to be
seen. Most states require 30 minutes before sunset, 30 minutes after
sunrise, any time wipers are on.

I think you have it backwards:

http://www.dmv.org/mt-montana/safety-laws.php

Headlights must be used:

30 minutes after sunset until 30 minutes before sunrise.
When visibility, due to foul weather, is reduced to 500 ft or less.


From the ontario highway safety act:

When driving your vehicle, headlights are required to be turned on
between one-half hour before sunset and one-half hour after sunrise,
and any other time of poor light conditions, such as fog, snow or
rain, which keeps you from clearly seeing people or vehicles less than
150 metres away.
150 meters, by the way, is well over 150 feet. ( like about 165)