Not sure if it's possible, but if there is an API to integrate with Siri to make navigation via voice commands that much easier.
Thank you for your suggestion!
As you may already know, Waze already allows voice commands.
Stay tuned for more feature updates on Waze’s social pages on Facebook and Instagram.
Juvescent Joys commented
and for android both:
• app shortcuts
If you have a jailbreak on your iphone you can us AssistantLove app to launch Waze when you ask siri for directions. I use it all the time...
Not possible for Siri yet. It is likely Apple will open some kind of API to Siri in the future given how popular it is.