Dell Streak User Manual page 101

Map layer
The map layer displays streets, highways, buildings, main establishments,
mass transit stations, parks, rivers, lakes, mountains, boundaries, and so on.
Traffic layer
The traffic layer displays colored lines along the roads where real-time traffic
data can be collected. Green lines indicate good traffic speeds, yellow ones
indicate slower speeds, and brown ones indicate congested traffic.
indicates where construction work is taking place; indicates where the
road is blocked.
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Internet