Profion tawelu traffig : arolwg o gynlluniau tawleu traffig ar rwydwaith cefnffyrdd a phriffyrdd Cymru : Rhagfyr 1999 = Traffic calming trials : a review of traffic calming schemes on the trunk and principal road network in Wales : December 1999 /
Wales.National Assembly.
Caerdydd : Cynulliad Cenedlaethol Cymru,
1999.
Teitl clawr = Cover title.
Llyfryddiaeth = Bibliography: p.44, 44.
Traffic engineering
Traffic safety
Speed limits