- ribbed floor
- ribbed shell
- ribbing arch
- ribbon structure
- rice paper
- rich concrete
- rich tone
- ride
- ridge
- ridge capping
- ridge plate
- ridge roll
- ridge roof
- ridge templet
- ridge truss
- ridging
- riding-hall
- rie collar
- rifled file
- rigging
- rigging device
- right turn
- righting moment
- rigid armouring
- rigid bearing
- rigid constraint
- rigid disk
- rigid duct
- rigid grillage
- rigid pilework
- rigid railing
- rigid roofing
- rigid sheets
- rigid shell
- road
- road asphalt
- road base
- road breaker
- road brush
- road builder
- road building
- road camber
- road classification
- road clearance
- road closing
- road concrete
- road construction
- road crust
- road deflection
- road design
- road drainage
- road embankment
- road forms
- road foundation
- road grade
- road gradient
- road kettle
- road location
- road maintenance
- road marking
- road mending
- road metal
- road mirror
- road mixer
- road network
- road oil
- road oiler
- road painting
- road patching
- road paver
- road pitch
- road relocation
- road repair
- road roller
- road rooter
- road route
- road scarifier
- road section
- road signs
- road spreader
- road sprinkler
- road standards
- road stone
- road structure
- road surface
- road surveying
- road tanker
- road tar
- road track
- road transport
- road tunnel
- road wave
- road widening
- road worker
- road-bed
- road-block
- roadability
- roadbed
- roadside
- roadside ditch