Depending on the noise and when and where the noise happens, i.e. squeaking noise, grinding noise, clunking noise happens when cold, warm, over bumps, during acceleration etc, problem can be safety issue or not.
I.E. 1. squeaking noise when going over bump could be related to sway bar link/mount - not safety issue.
I.E. 2. Clunking noise over bumps, could be broken coil springs, ball joint, sub-fram, etc - Safety issue.
I.E. 3. Noise happens during acceleration associated with vibration, could be driveshaft (inner and outer CV joints) - safety issue.
I.E. can go on and on.
Recommending go to a repeatable garage to road test with a technician, tell him what noise you are hearing during in order to save the diag time.