The sign is in this matter is found at s. 22(7) in Regulation 615.
http://www.e-laws.gov.on.ca/html/regs/e ... e.htm#BK23 Section 45 artculates where the sign can be posted. Since the sign was erected in accordance with section 22, s. 49 governs the sign requirments and if the sign does not meet the requirements of s. 49 then the sign is invalid and unenforcable.
22(7) Every sign that restricts a vehicle from proceeding straight through an intersection shall,
(a) be not less than 90 centimetres in height and not less than 60 centimetres in width; and
(b) include the markings and the dimensions as illustrated in the following Figure:
Section 45, 47 and 49 expressly states;
45. A sign prescribed by this Regulation, other than a sign prescribed by section 13, 14, 15, 24, 25, 26 or 27, shall be so placed as to be visible at all times for a distance of at least 60 metres to the traffic approaching the sign. O. Reg. 175/08, s. 15.
47. Where the characteristics of a highway make it impracticable to place a sign or pavement markings as specified in this Regulation, the sign or pavement markings shall be placed so as to comply as nearly as practicable with those requirements. O. Reg. 699/92, s. 5.
49. Where a sign is erected in accordance with sections 21, 22, 23 and 34, the sign is internally illuminated, or changed by means of dot or disc matrix or louvers, the sign shall only be legible to approaching drivers during the time of operation and shall comply as nearly as practicable with those requirements and dimensions as prescribed. R.R.O. 1990, Reg. 615, s. 49.