324.1 Corner risks

Corners invite shallow, fast entries (214). Use island noses and staggers. HVM bollard corners need tighter nominal gaps (232). Put a higher-class crash rated bollard at the nose (235).

Corners shorten the run-up distance only if the corner geometry forces speed loss. Where the kerb returns form a wide throat, introduce a small corner island and staggered posts to break the straight line of approach (225). Target a reduced clear-gap at the apex, and—where the risk case demands—specify the higher-tier post at the island nose to absorb the first strike.

324.2 Turning paths

Respect swept paths for service and fire (325, 233). Shape HVM bollard corners to allow turns while preventing cut-throughs. Ensure crash rated bollard sockets clear utilities (243).

Use tracked-vehicle turning radius (approach) checks to size openings for legitimate vehicles while maintaining security blocking. If a corner requires a wider inside radius for fire access, offset posts on the outer arc and keep a defend line across the throat using a short stagger. Confirm minimum utility clearances and, if clashes persist, switch the nose post to a shallow foundation class (244) coordinated with ducting & pathways (246).

324.3 Refuse & delivery islands

Islands can both guide and obstruct. Position HVM bollard posts to avoid vehicle climb. The island tip may host a crash rated bollard with reinforced base (331).

Delivery aprons often invite cut-throughs during reversing. Place a robust nose post at the island tip and space the trailing posts to remove “hooking” gaps. Keep island faces steep or protected by edging to reduce tyre climb. Tie any upspec post at the tip to the impact-load & foundation checks (331) and provide a drain-out route to avoid standing water against sleeves (334).

324.4 Kerb radii treatment

Large radii increase vector speed (227). Reduce effective radius with staggered HVM bollard posts; keep the primary crash rated bollard on the inside line.

Where a generous kerb return encourages corner-cutting, “shrink” the effective radius by moving the first two posts inward along the bisector and setting a short stagger. This forces a steering correction and adds frictional losses before any strike. Keep the primary post on the inner track—closest to the predicted impact line—and confirm visibility to crossing pedestrians with a quick check against sightlines & signage (237).

324.5 Pedestrian squeeze points

Avoid narrowing below code (231). HVM bollard posts frame sightlines (237). Add reflectors on any nearby crash rated bollard (313).

Corner geometry plus furniture can create accidental squeeze points. Maintain required effective width and preserve an open egress cone. Use low-profile heads where visibility is critical and add retroreflective bands only where they genuinely aid wayfinding. At shared-use corners, align post rhythm to pedestrian desire lines and avoid forcing diagonal walks across vehicle vectors.

324.6 Cyclist routes

Provide safe pass-throughs and avoid handlebar traps. HVM bollard gaps offer 1.5–2.0 m cyclist lanes where permitted. Do not place a crash rated bollard within the cyclist line of travel.

Design any through-cycle lane as a deliberate, well-signed pass-through, not a leftover gap. Maintain a smooth, obstruction-free lane with sightlines to side-roads and keep bollard heads outside bar-sweep. Where mixing with pedestrians, consider a stewarded gap policy at peaks and confirm surface transitions do not introduce slip risks at the apex.

324.7 Sightline preservation

Keep low heads or increased spacing where visibility is vital (237). HVM bollard rhythm remains legible; confirm crash rated bollard height doesn’t block views (312).

At junctions and driveway exits, prioritize the driver cone and stopping sight distance. Choose lower-profile heads or increase spacing marginally—then prove your clear-gap still passes under height-setting guidance (312). Use consistent cap types across the corner to preserve legibility and reduce distraction (313, 316).

324.8 Drainage at corners

Ensure falls lead away from sockets (245). Ponding undermines HVM bollard sockets and corrodes a crash rated bollard base (334, 361).

Corner low points concentrate runoff. Grade surfaces so water bypasses sockets; where unavoidable, collect via a small drainage sump and connect to a verified outfall. Add covers with anti-slip finish in pedestrian routes and keep maintenance access clear. Coordinate duct entries and gland plates to prevent backflow, and document tests in the ITP and SAT evidence set (714, 638).

324.9 Detail examples

Provide three corner details with centers, falls, and utilities notes. Identify the crash rated bollard variant per detail (415).

Typical A (tight urban corner): 1) staggered posts closing the apex; 2) shallow foundation at the nose to clear red-zone utilities (243, 244); 3) crossfall away from sleeves toward a gully (245, 334). Typical B (service-yard island): 1) reinforced nose post tied to foundation checks (331); 2) edging to prevent tyre climb; 3) marked keep-clear zone. Typical C (shared-use path): 1) deliberate 1.8 m cycle pass-through; 2) low-profile heads; 3) reflector bands only on outer posts for conspicuity (313).

324 Corners, Islands & Pinch Points — FAQ