The Effects of Commercial Electronic Variable Message Signs ...
The Effects of Commercial Electronic Variable Message Signs ...
The Effects of Commercial Electronic Variable Message Signs ...
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<strong>Variable</strong> Ref. # Advantages Disadvantages<br />
2.3.1 Average daily traffic;<br />
peak traffic; level <strong>of</strong><br />
service<br />
2.3.2 Traffic mix: cars,<br />
trucks, buses, motorcycles<br />
118 Likely to increase driver<br />
workload.<br />
44<br />
Less important.<br />
2.3.3 Pedestrians Mainly only in urban<br />
settings.<br />
3.0 Vehicle 59<br />
3.1 Type: automobile;<br />
SUV; truck; motorcycle<br />
3.2 Condition: response;<br />
vehicle dynamics<br />
3.3 Windshield: size;<br />
tinting; field <strong>of</strong> view<br />
4.0 Driver 10<br />
4.1 Characteristics: age;<br />
gender; demographics<br />
4.2 Experience: years<br />
driving; route familiarity<br />
4.3 State: alert; fatigue;<br />
alcohol; drugs<br />
4.4 Distractions:<br />
conversation; eating; cell<br />
phone<br />
5.0 Environment<br />
53, 23,<br />
12, 54<br />
Motorcycle has least<br />
obstructed view.<br />
Defines some stimulus<br />
exposure characteristics.<br />
15, 100 Route familiarity extremely<br />
important.<br />
24, 90,<br />
25<br />
5.1 Visual—general 113<br />
5.1.1 Visual clutter; nearby<br />
billboards; ambient lighting<br />
160,<br />
15, 32,<br />
44<br />
Complexity <strong>of</strong> visual<br />
environment extremely<br />
important.<br />
Hard to determine in field.<br />
Less important.<br />
Difficult to measure.<br />
Difficult to specify.
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