To answer your question about the road sign. The US, Asian countries, Central American countries, Canada, Australia, and some African countries uses the road sign called Manual on Uniform Traffic Control Devices (National standard road sign for United States). The European road signs are called Vienna Convention on Road Signs and Signals which is used in Europe and some other countries. Signs are very different.

Here is the helpful road signs info.

Vienna Convention on Road Signs and Signals:

https://en.wikipedia.org/wiki/Vienna_Convention_on_Road_Signs_and_Signals

For Manual on Uniform Traffic Control Devices:

https://en.wikipedia.org/wiki/Manual_on_Uniform_Traffic_Control_Devices

For general road signs: https://en.wikipedia.org/wiki/Traffic_sign

Hope that helps.