This is my personal list of the best racing games for Android/IOS devices to kill time or have some fun on the go If you want to see my full opinions and bits of gameplay have a look at the video below.
5 - Traffic Tour
Android: https://play.google.com/store/apps/details?id=com.wolvesinteractive.traffictour&hl=it
IOS : https://itunes.apple.com/us/app/traffic-tour/id1143534271?mt=8
4 - Race Kings
Android: https://play.google.com/store/apps/details?id=com.hutchgames.racingnext&hl=it
IOS: https://itunes.apple.com/us/app/race-kings/id988762223?mt=8
3 - Asphalt 8
Android: https://play.google.com/store/apps/details?id=com.gameloft.android.ANMP.GloftA8HM&hl=it
IOS: https://itunes.apple.com/us/app/asphalt-8-airborne/id610391947?mt=8
2 - Car X Drift Racing
Android : https://play.google.com/store/apps/details?id=com.CarXTech.CarXDriftRacingFull&hl=it
IOS : https://itunes.apple.com/us/app/carx-drift-racing/id644907661?mt=8
1 - Real Racing 3
Android: https://play.google.com/store/apps/details?id=com.ea.games.r3_row&hl=it
IOS: https://itunes.apple.com/ch/app/real-racing-3/id556164350?l=it&mt=8
Enjoy!!