Check the regs for your campus, some have rules about mace &/or pepper spray and what concentrations are allowed and which are not. It would be bad to be worried about crime and get suspended in the process.

As to being safe or not, only you can make that decision. I gave up on one 22 mile commute over the final two miles due to the traffic and uninsured bad drivers. One round trip and that was it, decided it wasn't worth my life.