Recognizing that theseroutes (and later metropolitan expressways and interstate highways) represented lines of greateraccess, Hoyt theorized that cities would tend to grow in wedge-shaped patterns, or sectors,eminating from the CBD and centered on major transportation routes. Higher levels of accesstranslate to higher land values. Thus, many commercial functions would remain in the CBD, butmanufcaturing activity would develop in a wedge surrounding transport routes.