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From page 1...
... SECTION I Summary Introduction Head-on crashes that occur on freeways are typically severe in nature and may be on the increase. A head-on crash typically occurs when a vehicle crosses the median and crashes with a vehicle traveling in the opposite direction (typically called a cross-median crash or median-crossover crash)
From page 2...
... • Reduce the severity of median-barrier crashes that occur • Enhance enforcement and awareness of traffic regulations • Improve coordination of agency safety initiatives These objectives are similar to those cited for run-off-road crashes (emphasis area 15, Volume 6 of this guide) and head-on collisions (emphasis area 18.1, Volume 4 of this guide)

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