There is a website providing traffic camera images that gets updated every few minutes.
My aim is to download the images over time to get a view of traffic conditions through the day.
The site uses a cookie to validate you are not a bot. You can verify this in chrome by opening the required image in a new tab, enabling developer tools and reloading the image.
I suspect the site owner does not want their data reused without permission.
If you believe the site owner would not object to your re-use you should open a conversation with them as they are likely to modify the image security methodology as soon as they notice someone bypassing it...