Shaykh Muhammad Ibn Hizaam was asked:
If a man wants to travel and he isn’t able to stop in the path for the prayer, is it permissible for him to combine between Dhuhr and Asr before he travels?
There is no problem that he does that in the situation of necessity and in times of needs, relying upon the
narration of Ibn Abbas that the prophet صلى الله عليه و سلم combined between Thuhr and Asr, and between Maghrib and Isha without (due to) any fear, nor travelling.
It was said to Ibn Abbas what did he (صلى الله عليه و سلم) intend with that? He said he intended not to overburden his nation.
Thus if you find a need, then there is no problem to combine between Thuhr and Asr whilst being a resident, during rare situations at times of needs.
Majid Jawed Al Afghanee