North America

Gribblenation.com - Includes information primarily covering the eastern third of the continent.
http://www.gribblenation.com/

Driving In The USA And Canada - Types Of Roads - Part of John Cletheroe's USA and Canada Holiday Hints. Resource about U.S. and Canada infrastructure written especially for British travellers.
http://www.johncletheroe.org/usa_can/driving/roadind.htm

The Expressway Site - Describes by state or province the highways which are high-speed divided thoroughfares with occasional at-grade intersections and no driveways.
http://www.expresswaysite.com/

Peter Creedon's House of Roads - Weblog rating facilities in Eastern Canada and the Northeastern U.S.
http://www.houseofroads.blogspot.com/

AARoads - Private page covering numerous aspects.
http://www.aaroads.com/

CANAMEX Trade Corridor - Transportation corridor connecting Canada, the United States, and Mexico.
http://www.canamex.org/

Places 2 Ride - A guide to motorcycle destinations - scenic highways, backroads and trails.
http://frontpage.tulsaconnect.com/maduko/

CapitalCorridor - Proposal for a route from Washington, D.C., to Ottawa.
http://www.thecapitalcorridor.com/

RoadTrip America - Various features including a forum, a list of scenic drives, a mobile Internet connection listing, and a gallery of unusual road signs, as well as other preparatory travel information.
http://www.roadtripamerica.com/

Milebymile - Route logs composed by tourist businesses located along the routes.
http://www.milebymile.com/

Highway and Road Conditions for Canada and United States - Organized by province/territory/state. Also includes weather, ferry, traffic and transit information.
http://www.highwayconditions.com/

North America’s SuperCorridor Coalition, Inc. - Non-profit organization dedicated to developing a multi-modal transportation corridor within the continent. Includes maps.
http://www.nascocorridor.com/