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@mwichary I would read this. BTW, most of the primary sources for US traffic sign standards history are online at https://t.co/4ZOYfWuiLp. On a more abstract level you might enjoy https://t.co/KN7ik261tz
@mwichary I would read this. BTW, most of the primary sources for US traffic sign standards history are online at https://t.co/4ZOYfWuiLp. On a more abstract level you might enjoy https://t.co/KN7ik261tz