Many modern cities feature grided streets made for walking, but suburbs' wide, winding roads require cars to get around. Learn why, plus how it might change, in this episode of BrainStuff.Learn more about advertising on the HowStuffWorks podcasts at www.howstuffworks.com/advertisers.htmAnd to learn about your ad choices when listening to podcasts, visit https://www.howstuffworks.com/privacy.htm#ad-choices
