Depends. It is not as easy as it used to be (i.e.: i haven't heard of people bribing police officers directly). However, what people working with / in the police told me is that once they send perpetrators to court, then they start "influencing" either prosecutors, judges, or someone within the chain.
From what I was told this is how it works:
Prosecutors are bribed to make intentional mistakes so that a judge will dismiss a case (called in Romanian "viciu de procedura", roughly translated to "procedural defect").
Judges themselves are bribed usually in high profile cases, and because of the many legal loopholes it is difficult to prove they are corrupt. Laws can often be interpreted two ways, and it's not uncommon that two lower courts give radically different sentences compared to higher courts.
I heard of cases where doctors are bribed so that a sudden serious health issue is discovered so the perpetrator doesn't get to serve time. Specifically related to traffic offences a high profile political figure recently killed two people, and although the guy was initially able to walk on his own, two days later, the individual was shown on a hospital bed unable to move. The media suspects both doctors and the judge will be influenced, because in Romania by law a judge has to establish what is the percentage of fault each party has. The guy was on the phone when he killed a car driving opposite lane, but since he has been injured "seriously" then the victim is also being blamed for ...injuring the perpetrator. Since he was hospitalized it's easier for a judge to say the victim had X% of fault and thus give a more lenient sentence.
Someone I know working for the economic police told me that they are told exactly whom not to verify, because they are known to do tax avoidance, but they "create jobs" (everything has an excuse) so they are to be left alone.
Basically, there are so many wholes in the system that one doesn't need to bribe the foot soldier, they can just bribe on part of the system and they will get away with it. Applies to traffic offences, financial crime and everything else.
Don't get me started to the amount of fraud that happens with EU funding in Romania as that's also ripe with creative ways to rig the system.
What I find very strange is that people really don't like talking about such issues, saying one should not bad mouth their own country, or when the EU raises such issues they raise the "non interference in internal affairs card". If the foreign media raises it then it's racism. There is a small number of people still opposing this, but recently the police has without shame started beating or harassing them. I see no change in sight because the culture itself is predominantly in favor of letting things work as they do.