Can’t achieve your dynamic deflection requirements at an isolated hazard along your continuous barrier? Consider reducing the post spacing at that point.
When utilised, the reduced post spacing of 1.0m should extend from a point 10m prior to the approach end of the hazard to a point perpendicular to the departure end of the hazard. Or on a two-way road, 10m either side of the hazard (See VicRoads RDN 06-08: The use of flexible and semi-rigid guard fence).

Photo source: Safe System Solutions Pty Ltd
Diagram source: Teng et al (2015), Effect of various W-beam guardrail post spacings and rail heights on safety performance