Speed trap installed at ERP gantry ?

[BengGaBoy]

Hi folks,

 

Just to check, there was a few occasion that I pass ERP gantry at CTE (towards city) and exit at Braddell exit, I noticed there were flash from the top (I think I encountered 2-3 times).

 

Initially, I thought it was due to no credit in the cash card or faulty IU, however, I realized after passing through the gantry, my IU will show the charges and balance on the display. So looks to me the IU and cashcard no issue.

 

Now I'm wondering whether is it due to my speed that ERP gantry flashes on me ? I'm not sure of my speed at the point of entry but it's definitely above 60Km/h.

 

Anybody have similar encounter ?

 

Thanks

[Dafansu]

The thing has been flashing for years