Thanks for the clarification. We do not typically have such checkpoints here in the United States, though occasionally individual state, county and municipal law enforcement agencies will establish drunk driving roadblocks - and whether you revealed your concealed weapon in that context would depend upon the law of the applicable state.This usually happens when you are on the road and there is a police check point(this is regular and the police put up check point in different places each day, you never know where they will be).
If they stop you and ask if you carry a firearm and you are legally carrying then they ask for the gun and permit, if you have HPs, they will state it is Ilegal some will say it is the law, if you confront them and ask what law they will comeup with something stupid like this: (I heard this one my self " It is ilegal for the private citizen to carry explosive ammo" In spanish Hollow point bullet is translated Bala Expansiva Ignorant people long ago began calling Hp Bala Explosiva this translates to Explosive bullet. Even if You try to explain what a HP is it is no use, all this time they have your weapon and there is a chance that if you give them a hard time they will take the gun just to make your life worst, so you end up leaving the ammo taking your gun and finishing your trip)
I know it sucks!!! but there is still hope. There are some advantages here, for example if you have a permit it also serves as a conceal carry permit. If you brandish without intention there is no concequence some others I will mention later.
I'm not familiar with the laws in your country, nor with the amount of latitude/discretion/potential for corruption granted to those law enforcement officers you might encounter, so my best counsel would be to use your best judgment.