This report summarises the off-road research trials on display parameters for the proposed Motorway Signal Mark 4 (MS4), carried out by TRL on behalf of the Highways Agency. The trials investigated both the legibility and comprehension of text messages and of pictograms. Dynamic trials established the comprehension of text messages and pictograms seen by drivers travelling at motorway speeds. Static trials investigated the legibility of text messages and pictograms. The results of these trials were used to establish the size of the MS4 display panel for the on-road trial. The results and recommendations of the dynamic and static trials led to further supplementary off-road research trials, which investigated legibility and developed an improved numeral set. The programme of work started in June 2000 and was completed in May 2002. (A)

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