Customs and police officers are guarding the bridge entrance. Show your passport or ID card to enter the terminal.
Or this:
The bridge entrance is being manned by customs and police officers. Bring your passport or ID card to pass the terminal.
There are as many as N ways to translate this. I am trying to stay away from the word-to-word translation. Trestle sound antiquated (popular usage in the 19th century, like the ones used in trans-continental railroad) and may not be appropriate for modern use. Since we are not sure of the context here I provided two slightly different versions.