I have firsthand experience with the problem. During an election observation mission to Ethiopia, I was teamed with observers from Switzerland. We were two hours outside of Addis Ababa when the Swiss embassy ordered them to stay where they were because of banditry along the main road to Addis. I had a flight to catch so I commandeered their car and prayed nothing happened.
As the driver pulled into the driveway of the Hilton Hotel, I noticed some Americans had already boarded the bus to the airport. The head of the delegation apologized and said they had no way to contact me.