S-2.1, r. 4 - Safety Code for the construction industry

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8.3.6. Self-propelled vehicles used for performing work in underground work sites shall:
(a)  if they are powered by an internal combustion diesel type engine, be equipped with an exhaust-gas cooling system making it possible to keep the gas at 83 °C, whatever the motor’s operating conditions may be;
(b)  be equipped with position lights indicating their maximum width;
(c)  not discharge into the air non-diluted exhaust gas containing over 0.25% carbon monoxide.
R.R.Q., 1981, c. S-2.1, r. 6, s. 8.3.6; O.C. 885-2001, s. 376.