I wonder if an early iteration of Hit Z Road included a mapboard. It would be a natural for this game, starting in Chicago and ending in LA, and could stick with the theme of "found" components (i.e. using the board from the fictional "Hit the Road" game).
Perfect! It even includes 8 "Route 66" signs along the highway's path, one for each round of Hit Z Road. Maybe draw in some stick figure zombies marching along the arrow paths on the board. (The Route 66 game also contains red, blue, green and yellow car tokens, matching the player colors for Hit Z Road.) So I just ordered a used copy of the Route 66 game off of Amazon for cheap, and plan on distressing the board to use with Hit Z Road.
Anybody got any good ideas for distressing it? Maybe spilling some coffee on it or something?