Johannesburg - Live testing of Gauteng's electronic toll transactions for vehicles with e-tag accounts is about to start.The SA National Roads Agency Ltd (Sanral) said on April 4, 2012: "Road users registered for Gauteng e-tolling and with an e-tag on their vehicle are advised that their e-tags will start beeping as they pass beneath toll gantries."That, Sanral says, should happen on Thursday, April 6, and the test has been scheduled to run in phases - not all toll gantries will be switched on simultaneously.Reassuringly, Sanral added: "During this test phase, no funds will be deducted from road users' accounts."'DO YOU HAVE A PROBLEM?'Sanral says the e-tags are supposed to beep once to show a toll has succeeded (without costing anything). More than one beep, or no beep at all, will require a phone call to the e-toll call centre (0800-726-725) or a visit an e-toll customer service shop. Bad beeps or no beeps could mean a problem with the user's e-toll account or the e-tag itself. It could, of course, also mean the gantry is not live...The same beeping will occur on the Bakwena toll road north of Pretoria.Sanral added: "Beeping on the Bakwena toll road is also part of this test phase, meaning the road users' accounts are not yet active and no funds will be deducted."IT'S AN OPTIONWhen tolling starts for real on April 30, 2012 e-tags will emit three types of beep - one for a successful transaction, two if funds in the person's e-toll account are low, or four (or none at all) if a transaction fails. Two, four or no beeps - again, ring the call centre or visit a service shop."Road users are reminded that the e-tag is optional and also entitles them to various discounts on their toll tariffs," Sanral said. "That includes the 48% e-tag discount.. Frequent-user discounts and the R550 monthly toll-fee cap will also be available to motorcycles and light motor vehicles fitted with an e-tag."Sanral will ensure that the testing phase is not disruptive."