Case at a glance: A roadway and adjacent public parking area were using a mix of steel and plastic marker posts. Some steel posts had been bent by vehicle contact, while some plastic posts had become faded and cracked after prolonged sun exposure. HotFRP supplied fiberglass marker posts for the replacement project, with impact behavior and outdoor UV exposure among the selection considerations.

Project Background

The roadway section includes a curved approach where delineator posts help guide drivers, particularly at night. The adjacent parking area uses shorter posts to separate vehicle lanes from pedestrian walkways. The original posts were galvanized steel or molded plastic.

In service, the steel posts had been permanently bent after minor vehicle contact, while the plastic posts had developed fading and cracking after exposure to direct sunlight. The maintenance team therefore looked for a replacement post that could better accommodate occasional impacts and remain suitable for an exposed outdoor installation.

Material Selection

HotFRP supplied fiberglass reinforced polymer (FRP) marker posts for the replacement. Impact behavior was an important consideration because the previous steel posts had been damaged by vehicle contact. Outdoor UV exposure was another consideration because the roadway and parking-area installations were not shaded.

The supplied posts had a UV-stabilized surface for the outdoor installation. In the project observations, the installed FRP posts could flex when contacted at low speed, and most returned to their previous position. This was relevant to the replacement objective because the previous steel posts had tended to remain bent after similar contact.

Installation Notes

Installation followed the general arrangement used for the existing delineator posts. Depending on the location, the posts were driven into prepared ground sleeves or set into compacted soil. In the paved parking area, base plates and mechanical anchors were used to secure the posts.

The posts were supplied in standard lengths for the specified installation locations. Their lower weight compared with the previous steel posts also made handling and positioning straightforward during installation.

Outcome and Observations

In the post-installation observations recorded for the project, the posts remained upright and legible. The reflective bands remained in place, and the base color showed no significant fading in the areas observed.

Several posts in the parking area were subsequently struck by vehicles at low speed. Most returned to their previous position, while one post required replacement after a more direct, higher-speed impact. The maintenance team also reported that the FRP posts required less attention than the previous mix of steel and plastic posts.

This case shows how impact exposure and prolonged outdoor exposure can both influence marker-post selection. For roadway and parking-area delineation projects, the relevant installation conditions, mounting arrangement, and expected contact exposure should be considered together when evaluating FRP marker posts.