When tourists travel to a country where they have to drive on a different side of the road it can be potentially dangerous. I am in New Zealand where we drive on the left. Accidents are often caused when tourists mistakenly drift onto the right as they are on auto-pilot, and cause a head-on collision.

Most of the rental car companies put a "keep left" sticker on the inside of the windscreen to remind drivers but I don't think this enough. My idea is that Waze would create a special "tourist" version of the audio guide that would include prompts for the driver to "keep left". Or in other countries that drive on the right, prompts to "keep right".

I thought it would be reasonably easy to overlay "keep left/right" prompts into existing directions at regular intervals. The driver would hear something like "keep driving on Main Street for 2 kilometres, remember to stay on the left side of the road". In order for the prompts not to become confusing and mixed up with "turn left" for example, the "keep left" prompts could be in another voice or pitch entirely. They could even be as simple as "[bell tone] keep left" being repeated every few minutes.

Basically I feel that verbal prompts could very well save lives in reminding tourists to drive on the correct side of the road. Road signs and signs in the windscreen are not distinctive or noticeable enough. I feel that this idea could be implemented quite simply and save lives. It may already be available but I haven't been able to find evidence of that.