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RELEVANT LINKS: <br /> �. 2. Motion, animation, video <br /> Motion can range from simple visual effects to full realistic video. Motion <br /> can extend the period of time a driver will keep watching a sign, increasing <br /> distractedness. Cities may prohibit motion or limit it either to specific areas <br /> or to specific characteristics such as a motion time frame calibrated to traffic <br /> speed. <br /> 3. Brightness <br /> Brightness can be a safety factor, particularly at night, as sudden brightness <br /> can be distracting or diminish night vision. A number of communities limit <br /> brightness based on time of day and by color displayed. This can be difficult <br /> to quantify and measure. <br /> 4. Sign placement and spacing <br /> The number of signs and their location can be a big factor in driver <br /> awareness. A large number of signs can increase distractedness. Poorly <br /> placed signs may block views or cause distraction in unsafe areas. Cities <br /> may impose site standards and spacing requirements. These may present <br /> regulatory challenges as spacing may be dependent on the actions of <br /> neighboring property owners. <br /> 5. Size of signs <br /> Size can have impacts in several ways. Too big, and it obstructs views and <br /> distracts. Too small, and it takes longer to read and encourages sign users to <br /> sequence messages. Cities may limit dynamic signs or the percentage of a <br /> sign that can be dynamic. <br /> 6. Text size and legibility <br /> Signs that are difficult to read invite increased driver focus. Regulations can, <br /> for example, require minimum sizes based on road speed. <br /> IV. Planning ahead <br /> Cities should think about dynamic signs as early as possible. Regardless of <br /> Minn.Stat.§462 357,subd. your city's approach, it is better to make a rational choice rather than having <br /> le. dynamic signs arrive before you have thought about the issue. Once the <br /> LMC information memo, signs are up, Minnesota's nonconforming use law arguably grants them <br /> Land Use Nonconformities. "grandfathered" status, with a narrow exception for safety. <br /> League of Minnesota Cities Information Memo: 7/27/2007 <br /> Regulating Dynamic Signage Page 4 <br />