Unidentified BEEP

Good afternoon all

So, here is my latest bugbear:
While bowling along down the autoroute at a sweet 59mph in 6th with cruise control on we have heard a beep. This has happened half a dozen times. It is a single short beep. We are not talking Road Runner and While-E-Coyote here. We have read the Boxer manual and the AutoSleeper manual but there is no indication of what it could be.
More information:
The grey water tank and Thetford cassette are both empty for travelling; drinking water no more than 50% full; the flushing reservoir is usually fairly full. Fridge is on auto, gas is off at the bottle. The carbon monoxide alarm sounds completely different.
Is the Nuevo trying to tell me something? Is it the ghost of a past owner who doesn't like my driving style?
As ever, all suggestions appreciated.

Pete

A nice idea, I will investigate but why would it be an occasional occurrence?

Thanks Bargee,
Pete

Silly suggestion, but I had the same in My Nue, turned out to be the smoke detector sounding off intermittently, even when I changed the battery it still happened.
Tomorrow I am at the dealers so will see what they have to say about it

You have a speed limiter via your 'menu' button, not related to cruise control, it just beeps each time you hit the set speed which is in 5mph increments. I tend to forget about it until it beeps at 70 so I've set it at 75 now , it's rare I touch 70 and only on motorways.

Thanks folks,

Here's my plan:
a] change battery in smoke alarm [which I'd forgotten we have]
b] read all about the speed limiter/menu in the Boxer manual

This could save my marriage.

Pete

I love this forum.

So, I've discovered that the smoke alarm battery is dead as Dillinger so that is not the beep problem [new battery tomorrow]. 
Having read Boxer manual I discovered that the speed limiter is on; now it is off. I am looking forward to beep-free days. 
Thank you to all contributors especially PaulMold.

Pete

Pete

On mine and presumably on EofT's (of very similar age) the cruise stalk is just the cruise stalk. We only have the limiter on the Mode button. Later vans have the limiter in conjunction with cruise.