GRP or concrete? Choosing a delineator material
Compare delineator materials through impact behaviour, visibility and installation together. Use the same application and documentation scope for both options.
| GRP (glass reinforced polymer) | Concrete post | |
|---|---|---|
| Body | Glass-fibre-reinforced polymer profile. | Concrete body for the selected model; section and reinforcement are project-specific. |
| Impact behaviour | The flexible post can bend and recover in typical grazing contact; the outcome depends on speed, angle and ground conditions. | Assess the rigid body’s impact behaviour for the selected product and installation. |
| Nominal dimensions | Overall 1300 mm; 800 mm above ground and 500 mm in the ground; body 100 × 3 mm. | Take the comparison concrete post’s dimensions from its own data sheet. |
| Body colour | Pigment is integral to the body compound; colour does not depend solely on a surface coating. | A painted or unpigmented surface depends on the specified concrete product. |
| Installation | Use a compatible driving tool for the ground-driven model; check the substrate and embedment against the project. | Embedment or foundation details are determined for the product and site design. |
| Sections with barriers | Use a separate reflector fitting on the barrier; do not assume a cutting or drilling detail for the full-length post. | A roadside post and a barrier-mounted reflector are distinct installation products. |
| Selection basis | Compare specification class, reflective surface, substrate and maintenance conditions together. | Evaluate the same use case and documentation scope; a material name alone does not establish performance. |
How should the material be selected?
Selection depends on the authority’s specification, substrate, route-maintenance conditions and documented product performance. There is no universal cost ranking for concrete and GRP; compare product, freight, installation and replacement for the project.
White or yellow?
Select the white or yellow body and reflector arrangement to the destination country’s specification. In the Turkish KGM arrangement, the driver sees red reflectors on the right and white on the left; this colour arrangement is not a universal rule for every country.
Sources: the GRP post data sheet and dimensional drawing, and the manufacturer’s GRP–concrete comparison. Use the selected product and project data rather than a general claim of superiority.
GRP roadside flexible delineator post