Regulations of Connecticut State Agencies
(a) The primary consideration in signal face placement shall be visibility.
(b) A minimum of two signal faces for each approach shall be provided and should be continuously visible from a point determined by a competent engineering study based on speed and visibility distances.
(c) Separate signal faces should be used when protected only turning movements are controlled by green arrows.
(d) Where physical conditions prevent drivers from having a continuous view of at least two signal indications, as determined above, a "Signal Ahead" sign shall be erected to warn approaching traffic. Hazard identification beacons may be surmounted upon these signs to emphasize the message. Special warning signs may be used to indicate driver action in adverse situations.
(e) A single signal face is permissible for the control of an exclusive turn lane. Such signal face shall be in addition to the minimum of two signal faces for the through traffic.
(f) At least one and preferably all of the signal faces required should be located within the range of forty to one hundred twenty feet from the stop bar, except at intersections where multi-lane cross streets or other conditions make it physically impractical. However, in no case shall this distance exceed one hundred fifty feet, unless a supplemental signal face is provided.
(g) Where both of the signal faces required are post mounted, they shall be on the far side of the intersection one on the right and one on the left or on the median island if practical, except as noted in (i) below.
(h) Where all signal faces are suspended by span wire or mast arm, they shall be visible from the lane of approach but shall not be to the left of the centerline. Where conditions warrant, exceptions may be permitted. On one-way streets, it is permissible to erect signal faces on both sides of the medial line.
(i) When deemed to be required, near-side postmounted signals should be located as near as practicable to the stop line unless substantially greater visibility may be achieved by locating it elsewhere.
(j) Where a signal face controls a specific lane or lanes of an approach, its transverse position should be unmistakably in line with the path of that movement.
(k) Required signal faces for any one approach shall not be less than eight and should not be more than twenty feet apart measured horizontally between center of faces.
(l) Supplemental signal faces should be used when an engineering study has shown that they are needed to achieve either advance or immediate intersection visibility. When used, they should be located to provide optimum visibility for the movement to be controlled. The following limitations apply:
(1) Left turn arrows shall not be used in near right faces.
(2) Right turn arrows shall not be used in far left faces. A far side median mount signal shall be considered as a far left signal for this application.
(Effective November 3, 1981; Amended December 9, 1999; Amended December 23, 2005)