I can only equate it to something along the lines of a visitor's guide. It lists everything from speed limits and interesting sights to train schedules. Everything a tourist in 1924 needed to know! 

 I have included a scan of one of the open pages below. Take a minute to check it out. Right click view image to read it if you are a Netscape user (is there anything else?). 

 Yes, I found it at a flea market.