On what legal grounds is the SA National Roads Agency Ltd (SANRAL) of the opinion that all metrology instruments of the Gauteng e-tolling system comply fully with the requirements of the Legal Metrology Act, Act 9 of 2014 and the Trade Metrology Act, Act 77 of 1973, despite the fact that the Chief Executive Officer of the National Regulator for Compulsory Specifications has indicated that SANRAL is not in compliance?