Decatur launches ”Smiley Face” Speed Display

Images work better than numbers

Based on studies conducted by Decatur Electronics Europe, images can be more effective than numbers to reduce speeding. Often drivers are not aware about speed limits in the region, even that it might be familiar area. Numeric information is not relevant enough and many displays do not indicate clearly enough when speed limit is exceeded. In field tests it was clear that image caught driver’s attention better than conventional number display. Surprising was that many drivers maintained speed while driving pass the numeric speed display, but slowed down while approaching “Smiley Face” display.

Instant Feedback function

Instant feedback is probably the major contributor for this. Speed is verified and compared to speed limit 10 times in second. This allows display to react any speed changes while driver is still approaching display. Display turns bright red and shows sad face if limit is exceeded. If driver reduces speed under the limit while still approaching display, it will show immediately green smiley face display and this way awards driver for reducing speed. This type of approach enforces correct behaviour more effectively than conventional speed display. Display was also designed as warning sign / triangle shape, which enhances visibility and noticeability.

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