You should contact a Maryland lawyer to get the legal definition that MD has, if there is one actually stated in their laws, of what an at-fault accident is considered to be. Some states have a standard of fault list for motor vehicle accidents however we were unable to find one for Maryland.
We can tell you that Maryland is a contributory negligence state, one of just a hand full of states that is, which means that to recover in an accident from the other party that you must show that they were negligent and 100% at fault. If you are even found 1% at fault for the accident than you are unable to recover from the other party's Liability insurance for your damages.
Fault in car accidents is usually determined by the insurance companies involved. They take into account any tickets written, if a person stated they were at fault, driver statements in general and witness statements. Insurance adjusters may also have to view the damages to the vehicles to see how the accident occurred.
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[Let CarInsurance.com help you find affordable auto insurance now.] Liability will usually fall on the driver whose negligence caused the accident. Negligence is in general defined as failure to exercise the degree of care considered reasonable under the circumstances (reasonable care and lookout) which results in unintended damages and/or injury to another party.
You can also contact the Maryland Insurance Administration, the insurance regulator for MD, for more information on this topic. | 
