“In the interests of providing the investigator... with as much information as is possible... [we] call on anyone who was stopped at the roadblock on the Linksfield Road onramp... or at any other place... to [come forward] and report it to the investigator,” Justice Project SA said a statement.
The SA National Roads Agency (Sanral) has denied holding the roadblocks in January and has labelled reports about them as a “malicious rumour”.
The rumours had social networks Twitter and Facebook aflutter.
Sanral said at the time: “No staff from either Sanral or its toll operator ETC have conducted any roadblocks as described in the e-mails and social network postings.”
The company said the rumours started after its staff were seen marking roads and that motorists had thought they were being stopped in a Sanral roadblock.