Why do lane control signals exist at all, when lane markings already show where the lanes are? · Q-0129

Why do lane control signals exist at all, when lane markings already show where the lanes are?

1. a Because some lanes change direction at different times of day
2. b Because they replace traffic lights at busy intersections
3. c Because they show the speed limit for each lane
4. d Because markings are invisible at night

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