As if traffic in Shanghai isn’t bad enough, the upcoming national holiday will be sure to increase headaches for already wary commuters. Shanghai Daily reports that police are warning people about increased congestion and offering tips on alternative routes as thousands flock to the Expo to pay some sort of homage to the homeland. Thinking of walking instead? Well, if you can safely dodge the influx of drivers you’ll still have to deal with the heavy layer of smog that will no doubt coat this city as 80,000 cars are expected on the Shanghai-Hangzhou Expressway. Let’s just hope these next few days don’t turn into the horrendous 15 day traffic jam that hit Beijing.