Tap a road to let its traffic go, tap it again to stop it. Never open two roads whose cars cross each other. When every car is through, the level is complete.
You have 5 lives. The first 10 levels never cost a life. After that a crash costs one life unless you continue the level. One life comes back every 20 minutes; you can also refill them with coins or watch an ad for one more.
After a crash you can pay coins or watch an ad to keep playing: the wreck and the cars in the junction are towed away and every road switches to STOP.
Open the shop (the + next to your coins on the main menu) and tap "Restore purchases". Coin packs and unlimited lives are consumable and cannot be restored.
If you are in a region where it applies, open Settings and tap "Privacy settings". You can also reset or delete your advertising ID in Android Settings under Google → Ads.
Write to emreqaraduman@hotmail.com with your Android device model, Android version and what happened. We usually answer within a few days.