JOHANNESBURG, Gauteng - The SA National Roads Agency Limited is claiming double the number of actual e-tag sales, the Opposition to Urban Tolling Alliance has claimed."Based on a statistically sound sample, Outa's research shows that only 15% of freeway users are tagged and nine percent of vehicles counted off the freeway were tagged," chairman Wayne Duvenage said."Obviously it is the freeway-user count that matters but the off-freeway count helps to corroborate our findings."RESEARCH SAMPLESEarlier on Wednesday (Dec 11) Sanral spokesman Vusi Mona said 890 388 VLN/e-tags had been committed but Outa's research showed, of a sample of 2098 cars which used the freeway, only 317 had e-tags - about 15%.Of a sample of 2236 cars which did not use the freeways 212 had e-tags - about 9.5%."Given that around one-third of cars in Gauteng did not use the freeway," Duvenhage said, "it was expected the non-freeway figure would be lower."Applying the sample to the total number of cars which use Gauteng's freeways each month - about 2.3-million - Outa believed the number of e-tags sold was only around 350,000."Even if one pushed the e-tag penetration rate to 20% the number in use would be no more than 450 000," Duvenage said. "That's around half the number of tags sales recently espoused by Sanral."He encouraged the public to do e-tag counts themselves if they did not take Outa's word for it."E-tags are easy to see, especially at traffic lights, on ramps and in shopping-centre car parks," he explained. "There's a new game for your kids while travelling around Gauteng - spot the e-tag!"Outa called on Sanral to come clean and provide the actual e-tag count passing under the toll gantries.Tolling of Gauteng highways started last Tuesday (Dec 3 2013) and Mona said it had gone according to plan.AND ON THE SEVENTH DAY...Vehicles owners without an e-tag have seven days to pay for the use of a tolled road. After that the transactions were processed and invoices issued."The first seven days of toll collection on the Gauteng e-roads have just ended so it is too early to report on the issuing of invoices for those e-toll transactions that have not been paid within seven days."However, internal processes have been running smoothly."He said it should be noted that the legal obligation to pay e-tolls arose from using the tolled roads and passing beneath a toll gantry."The legal obligation to pay toll[s] therefore does not arise from an invoice forwarded to a user."Mona said 42 of the 45 toll gantries were fully operational. The other three could be calibrated only when road work was finished.