Why is horizontal traffic signal head not recommended?
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Horizontal traffic signal heads are not recommended due to visibility issues . Complaints have been received regarding the visibility of these signal heads, and the evaluation presented in one study analyzed the visibility of these signal heads on a tangent roadway alignment based on satisfactory motorists' cones of vision . The study found that to meet the satisfactory horizontal cone of vision specified by the Manual on Uniform Traffic Control Devices (MUTCD), a ramp control signal head has to be placed a minimum of 13.3 m downstream of the limit line . Therefore, the placement design of horizontal traffic signal heads needs to consider the horizontal satisfactory cone of vision to ensure visibility for approaching motorists .
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| Papers (5) | Insight |
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| The provided paper does not discuss horizontal traffic signal heads. | |
Open access 01 Jan 2012 1 Citations | The provided paper does not mention anything about a horizontal traffic signal head or why it is not recommended. |
01 Dec 2018 | The provided paper does not mention anything about why horizontal traffic signal heads are not recommended. |
| The provided paper does not mention why a horizontal traffic signal head is not recommended. | |
| The provided paper does not mention why a horizontal traffic signal head is not recommended. |
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