What might cause Nissan Altima beeping noise while driving?

If You have a modern model year of the Nissan Altima with a navigation head unit, the most common reason it will beep at You is because You're exceeding the speed limit! This sounds like some pretty awful nanny surveillance technology. Luckily, it's relatively simple to go into the settings menu and disable the sound. On the other hand, this isn't the only thing that might "beep". You may want to check to ensure that all of Your doors are sufficiently closed, and the driver and passengers (if applicable) are each wearing their seatbelts. These are also common "errors" where the Altima will warn You with a beep. While it can be annoying, just be aware that it's typically for the best.