This project involved the improvement of an urban bus corridor and several key road junctions, including bus lane boundaries, areas around bus stops, traffic islands and accessible pedestrian crossings.
The road is subject to frequent bus traffic while also accommodating vehicles, waiting passengers and pedestrians. Natural granite kerbstones were therefore selected, with specifications developed for straight sections, traffic island corners and accessible crossings to create continuous boundaries between different functional areas.
Continuous Road Boundaries Along the Bus Corridor
Buses operate frequently along fixed routes, with repeated approach, stopping and departure movements around bus stops. This places higher demands on the stability and continuity of road edges.
Standardised granite kerbstones were used along the main sections, with length, height and exposed dimensions determined according to the road design and installation control lines.
On long straight sections, particular attention was given to alignment, joints and height consistency between adjacent kerbstones. This helped reduce local misalignment and created a clear, continuous boundary between bus lanes and pedestrian areas.
Custom Curved and Corner Kerbstones for Traffic Islands
Traffic islands were among the more demanding areas in terms of stone processing.
Using numerous short straight kerbstones to form curves would increase the number of joints and could result in an irregular island profile.
Before production, curved and corner specifications were therefore developed according to the geometry of each traffic island and the required road turning radii. Straight, curved and corner units were processed separately to achieve smoother transitions while reducing on-site cutting.
Gradual Height Transitions at Accessible Crossings
Standard road edges require sufficient kerb height to separate vehicle and pedestrian areas. At pedestrian crossings, however, wheelchairs, strollers and wheeled luggage require a smoother transition.
Instead of lowering the kerbstone abruptly, gradual transition sections were introduced according to the width of each crossing.
Standard-height kerbstones gradually descend toward the accessible crossing and then return to the normal height on the opposite side. This maintains visual continuity along the road edge while reducing sudden level changes.
Accessibility and Drainage Detailed Together
Kerb height transitions, tactile paving, pedestrian crossings and waiting areas on traffic islands were developed as integrated details.
When determining the dimensions of transition kerbstones, the width of tactile paving and pedestrian movement direction were considered at the same time. This reduced small cut pieces and irregular joints around important crossing points.
Drainage also required particular attention. Once the kerb height changes at a crossing, the original path of surface water can also change.
Road gradients, kerb transitions and drainage inlet positions were therefore coordinated to reduce the risk of water collecting at accessible crossing entrances while maintaining effective road drainage.
Processing and Numbering by Detail Type
The project required straight units, curved units, corner pieces and transition kerbstones of different heights. Factory production was therefore not organised simply by dimensions.
After the detailed design was completed, individual specifications were classified according to road section and detail type. Kerbstones for traffic island corners, curved sections and accessible transitions were processed, inspected and marked separately.
After delivery, the materials could be installed according to their designated areas and installation sequence, reducing specification mix-ups, additional sorting and secondary cutting on site.
Completed Project
After completion, the granite kerbstones formed a continuous and stable road boundary along the urban bus corridor.
Straight sections maintained a clean alignment, while custom curved and corner units created continuous profiles around traffic islands. At accessible crossings, gradual height transitions provided smoother connections with pedestrian paving.
Tactile paving, drainage facilities and road edges were also integrated within the same system, creating clearer relationships between bus lanes, traffic islands and pedestrian areas.
Conclusion
Kerbstone construction along an urban bus corridor involves much more than installing a continuous row of stone. Straight sections, curves, corners, height transitions, accessibility and drainage all require different detailing.
In this project, different road conditions were translated into corresponding granite kerbstone specifications during the design development stage, followed by classified production, numbering and coordinated on-site installation.
For urban public transport infrastructure, the value of high-quality granite kerbstones lies not only in their durability, but also in precise specification and custom processing that create continuous, stable and maintainable boundaries between bus corridors, traffic islands and accessible pedestrian crossings.