On Wed, 21 Mar 2018 19:54:06 -0400, Wolf K
wrote:

On 2018-03-21 19:27, Gene Wirchenko wrote:
On Wed, 21 Mar 2018 16:49:47 -0400, Wolf K
wrote:

On 2018-03-21 15:42, J. P. Gilliver (John) wrote:

[Live highway signs] would. Not just the cost of the signs, but their supporting
infrastructure, and its and their maintenance. Even just the cost of the
wire, in some areas, would not be insignificant.

Use solar power and rechargeable batteries (already used in a lot of
situations up here, mostly for temp signs and lights in construction
zones), and low power radio to communicate with the car. Easy-peasy (a
hobbyist could probably whip one up on a Raspberry Pi in a day or less).
The chips can be reprogrammed remotely as needed, lots of choice for that.

Snow-covered signs?

????

In British Columbia (and probably some other places), snow can
stick to signs to the point where the signs can not be read.

Sincerely,

Gene Wirchenko