Road maintenance is inadequate in many areas and some long-distance roads through the Amazon forest are impassable much of the year due to flooding. Private cars and public buses are the main modes of inter-city road travel. Buses can range (depending on route and price) from luxurious and well-maintained to basic and mechanically unsound. Bus hijacking can occur at random.
Employment based immigrant visa cases take additional time because they are in numerically limited visa categories. The length of time varies from case to case and cannot be predicted for individual cases with any accuracy. Some cases are delayed because applicants do not follow instructions carefully. Some visa applications require further administrative processing, which takes additional time after the consular officer interviews the applicant.
- A signed Affidavit of Support from your petitioner and any additional financial sponsors who submitted a Form I-864 on behalf of your visa application.  Applicants may bring photocopies and scanned versions of signed Forms I-864 and associated documents. (Please note that the form must still be signed; typed names and electronic signatures will not be accepted.)

Hi Rakhi! UK visa application doesn’t ask specifically for a leave approval letter. But I have seen quite a few cases approved/denied based on that particular document. I’m assuming that leave approval letter works as a reaffirmation of strong ties to one’s home country. If you want to have higher chances of approval, I suggest including a leave approval letter from your employer.
Certain foreign maritime workers are eligible to apply for a Transportation Worker Identification Credential (TWIC) once in the U.S. If you, as a maritime industry worker, will perform services in secure port areas, your visa must be annotated “TWIC Letter Received.” Workers whose visas are not annotated will not be permitted by the Transportation Security Administration (TSA) to apply for a TWIC.
Almost 100 countries do not require visas for U.S. citizens to enter, though they do require entrants to have passports. Countries commonly put limits on the length of stay without a visa. U.S. visitors can stay anywhere from 14 days to six months without having to get a visa, with the majority of countries requiring residence visas after three months.

Crime statistics and trends indicate that persons face an elevated risk of robbery or assault using public bus systems throughout Brazil. Consider avoiding the use of public, municipal buses in Brazil at any time of day, and especially at night. The U.S. Government recommends against personnel using public, municipal buses in all parts of Brazil, and prohibits personnel from using public buses in and around Recife. 

Azerbaijan also strictly bans any visit by foreign citizens to the separatist region of Nagorno-Karabakh[633] (the de facto independent Republic of Artsakh), its surrounding territories, and the Azerbaijani exclaves of Karki, Yuxarı Əskipara, Barxudarlı, and Sofulu which are de jure part of Azerbaijan but under the control of Armenia, without the prior consent of the government of Azerbaijan. Foreign citizens who enter these territories will be permanently banned from entering the Republic of Azerbaijan[634] and will be included in their "list of personae non gratae".[635] As of 2 September 2019, the list mentioned 852 people.