GST2 & GST2A
Trief is a safety kerbing system which is designed to contain and re-direct vehicles safely back onto those carriageways where, if they were to stray unchecked, they may cause injury to pedestrians, damage to local structures or damage to the vehicles and drivers themselves. In these instances, Trief Kerb will provide better containment of vehicles than standard kerb units.
The Brett Trief Kerb has been designed and proven to work in three ways to prevent vehicles leaving the carriageway:
1. The Trief Kerb is designed to present a clear visual signal to road users that it will prevent vehicles trying to leave the carriageway. Its height also discourages pedestrians from crossing the highway. The result is that the separate streams of road users are effectively segregated - a key contributor to enhanced road safety.
2. The Trief Kerb has a 25mm upstand from the highway surface leading onto an inclined shoulder. This is essential to give road users an initial physical warning that their vehicle is leaving the carriageway and that they need to take action to bring their vehicle back onto the carriageway. The inclined shoulder will help the driver bring the vehicle back onto the carriageway.
3. The Trief Kerb is designed to capture the sidewall bulge of a vehicle tyre within its concave section, thereby helping to contain the vehicle within the carriageway boundary. Once contained, the result is that the tyre is turned parallel to the kerb thereby minimising the upward traction available to the tyre and its ability mount the kerb
The famous Trief Kerb is available in two sizes GST2A for use on carriageways and roads with typical traffic speeds of 40mph and GST2 for use in areas of reduced excavation, such as bridge or car park decks where a containment kerb is still required. The wider Trief Containment Kerb system is comprised of a range of components, including quadrants, short lengths, as well as radius and transition kerbs. Although typically supplied in a smooth concrete finish, the Brett trief can also be supplied in a rough 'washed ' finish or in natural Granite.
This allows for a wide range of design possibilities that can address specific site constraints and safety considerations. The use of transition kerbs allows Trief Kerbs to be seamlessly integrated into existing half batter kerbs.