The doors of Roman arched gates: rectangular and with lunettes?

[WuZhuiQiu]

Some Roman city gates were built with arches. Would the doors of those gates have been curved, to fit the arch, or would they have been rectangular, with a semi-circular lunette above to fill the space between the doors and the arch?

https://en.wikipedia.org/wiki/Lunette

Or were the door leaves rectangular such that they might have covered the arch, yet opened outward?

[wmyers]

Good question.

If this was based on historical research:

[OSHIROmodels]

Educated guess. I would reckon it would depend on the usage and affluence of the person who had the doors made. A cheaper or utilitarian building would have the door flat at the top (cheaper to make), a posh or somesuch build would have the curve at the top.

[fred]

Just had flick through a couple of Hadrian's wall books.

The two styles I can see are large square gates behind the arch, or arch shaped gates within the arch.

There is a drawing of probably the same fort as the airfix one, but from the angle I can't tell the shape of the gates.

[WuZhuiQiu]

Thank you for your replies. Here are even more observations and questions for thought!

Reconstruction artwork in a tourist guide shows one of Pompeii's gates in the background with an iron grille in the lunette and rectangular door leaves below.

About shape, presumably, if a gateway is beneath a barrel vault, then rounded door leaves would have to open outward, since they could not fully open inward. From a defender's perspective, would outer doors that opened outward or inward have been better? If outward, then besiegers might more easily have blocked a sortie's egress.

Did Roman gateways even incorporate barrel vaults? The Airfix fort doesn't.

And look at these posh, rectangular Ancient Roman doors:
https://en.wikipedia.org/wiki/File:Bronze_door,_Basilica_di_San_Giovanni,_2013.jpg

Could curved door leaves have been reinforced as strongly as rectangular leaves?

[wmyers]

For reinforcing, movies always seem to show a single bar going across.

If I was afraid of a seize assault, why have only the ability to have a mere single bar across to brace it?  I’d have several at different heights.

I’m not sure what archeological evidence shows, however.

[WuZhuiQiu]

For reinforcing, movies always seem to show a single bar going across.

If I was afraid of a seize assault, why have only the ability to have a mere single bar across to brace it?  I’d have several at different heights.

I’m not sure what archeological evidence shows, however.

Agreed re. barring the gates! I meant reinforcing as in built-in reinforcement in each door leaf. Curved joinery may have been tricky, unless curved timbers were used?