There were 11 casualties on the A472 close to Ystrad Mynach Primary School since 2005, according to the website crashmap.co.uk – five of which were deemed serious although none were fatal.
The figures do not include an incident where a 14-year-old boy was knocked over last October, making the total 12, although no school pupils were involved.
Parent-of-four Rob Symes carried out the research in a bid to make councillors aware of the issue.
Mr Symes said: “With these statistics presented, how can Caerphilly Council push these proposals for a 180 space car park that would attract further traffic on the A472?
“With these statistics now available to them, when are they going to do something to make that road safer instead of busier?
“It worries me how dangerous it is and it really annoys me that nobody at the council will do anything to acknowledge there is a problem there.
“The fact they are planning to attract further traffic down that road at times when children as young as four-years-old are walking to school makes me question their sanity.”
Overall casualties in traffic accidents have fallen significantly over the last ten years.
In 2014 there were 296 casualties in Caerphilly County Borough compared with 507 in 2005.
Of these two were fatal and 28 serious, compared with 11 fatal and 66 serious ten years ago.
A Caerphilly County Borough Council spokesperson said: “As part of our road safety obligations, we review all police recorded collision statistics on a regular basis, and will always investigate any areas of particular concern that have been highlighted through this process.
“Specifically in relation to this issue, the applicant would be expected to review the collision history for the area, which would form part of the planning application process.
“As a recent scrutiny report mentions, Caerphilly County Borough has seen a notable decline in the total number of road casualties occurring over time, with 211 fewer casualties being recorded in 2014 than in 2005.
“This notable reduction reflects the sustained and coordinated programme of work that has been undertaken over a number of years to reduce the number of road casualties.”