They were arrested 2 weeks ago near Cullompton
A man and a woman, who reportedly had sex on a National Express service as it travelled along the M5 will face no further action.
A 29 year old man from Bristol and a 32 year old woman from Barnstaple, were arrested on suspicion of an act of outraging public decency.
Now Devon and Cornwall Police say CCTV from the bus was "inconclusive".
Teenager jailed for train station rape
He also sexually assaulted a girl on a train
Anger over planned Plymouth road closure
Traffic would be diverted to congested Deep Lane Junction
Cyclist in serious condition following hit and run
Bovey Tracey road closed for several hours
Paignton shopping centre to become car park
'It has the potential for a catalytic regeneration development'
Devonport dockyard is out of 'special measures'
Safety improves after 12 years of 'enhanced attention'
Duke of Cornwall visits Cornwall
VIDEO Prince William makes pasties
