Well I am not sure about Doha but one of my friend in Oman told me that the persons coming from Oman dont care for the Radar because they dont have to pay anything neither in Dubai nor in Oman. As Oman is very near to Dubai so people usually come from Oman to Dubai regularly. So thats why i asked if someone has practically paid the fine in Doha while he was caught by Radar driving in UAE.