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Any pattern or texture with gradual undulations that have a maximum relief of 20 mm over a distance of 300 mm. Gaps, slots, grooves, or joints of any depth with a maximum width of 20 mm and a maximum surface differential across these features of 5 mm. No patterns with a repeating upward sloping edge or ridge. Any pattern or texture with a maximum relief of 64 mm, if such pattern begins 610 mm or higher above the base of the barrier and all leading edges are rounded or sloped to minimize any vehicle snagging potential.

Wheel) on the asperities. NCHRP Report 350 uses two basic design test vehicles: a 2,000-kg pickup truck (denoted 2000P) and an 820-kg passenger car (denoted 820C). The 2000P is generally considered to be the more critical of the two design vehicles in regard to assessment of OCD. For this reason, it was the primary design vehicle used in the simulation effort conducted to establish the preliminary guidelines. Simulations with the 820C were to be used as a check to determine if the preliminary relationships required modification based on vehicular instability or other concerns with the small passenger car.

A plain, single-slope concrete barrier and W-beam guardrail were used as a control. Computer models of the rails were created and then inserted into photographs of rural and urban background scenes. This resulted in 30 scenes. • Two hundred and fifty randomly selected individuals were shown a series of three scenes in rapid succes- Figure 26. Alternative G—concrete post and beam. sion (2 to 3 seconds per scene) and then asked to rank the scenes in terms of their visual quality, from memory. A descriptor term was provided to aid the respondent in describing the feeling or emotion sensed when the photograph of the barrier/rail and scene were viewed together.

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