road sign 
noun
A sign giving information or instructions to road users.He derives the title of his exhibition from a road sign which warns passing motorists to beware of the horses....
- A road sign slowly approached informing them of the name of the next prairie town, 25 kilometres away.
- I looked at the road sign indicating we were in the next Emirate, Umm Al Quwain.
- aerodromic
- aerodromics
- aerodynamic
- aerodynamically
- aerodynamic braking
- aerodynamicist
- aerodynamics
- aerodyne
- aeroelastic
- aeroelastician
- aeroelasticity
- aeroelastics
- aeroembolism
- aero engine
- aerofoil
- aerofoiled
- aerogel
- aerogenerator
- aerogenic
- aerogenous
- aerogram
- aerogramme
- aerograph
- aerographer
- aerographic