Is it possible to pause Zombie Highway 2?

Sometimes I get disturbed while playing Zombie Highway 2. I then want to pause the game, or see the objectives in detail (not just the upperleft abbreviated). Is this possible?

I know I can change my equipped weapon, but then I'll need to reload it (afaik). That has to chance to leave me vulnerable. I also haven't got the opportunity to view my objectives when I do that.