The McAllen International Bridge System advises travelers of possible extreme delays upon return, due to recent changes to Customs and Border Protection’s policy in screening U.S. citizens and legal residents crossing at international bridges.

Beginning Friday, CBP officers will ask travelers at the international bridges returning from trips to Mexico whether the trip was essential or non-essential.

According to a news release, CBP officers will determine whether the trip was essential or non-essential. Those returning will then be placed in either an essential or non-essential line for processing.

CBP is not refusing entry to U.S. Citizens or U.S. residents.

Non-essential travel lines may face severe and extreme delays. Those who travel across should exercise caution and expect possible delays upon their return.

Travel restrictions for foreign nationals has been extended to September 21.

There is currently no guidelines from CBP on what constitutes essential or non-essential travel.