Higgins wanted to pass two cars. He passed the first on the left; the next car moved to the center of the road, so Higgins tried to pass on the right.
It was reported as being about 8:20 pm, so, dusk. Still if there was room to pass (and it was a passing zone, one-way northbound), there was presumably room to see ahead of both vehicles he was trying to pass...unless he's one of those drivers who never sees anything except whats' dead ahead.
For what it's worth, this is the stretch of road (looking northbound, which is the direction Higgins was reportedly going) where the accident occurred, according the the Courier Post. Higgins tried to pass on the right?
From the Courier Post article:
Higgins struck the brothers while trying to pass a sedan and an SUV on northbound Pennsville Auburn Road, also known as County Route 551, near Stumpy Lane in Oldmans Township.
According to the probable cause statement, Higgins said he had passed the sedan when the SUV in front of him pulled to the center of the road as it passed the bicyclists.
Higgins said he thought the SUV's maneuver "was a counter action to prevent him from passing," the statement said. He then tried to pass the SUV on the right, striking the Gaudreau brothers on the narrow shoulder.
I haven't looked up the New Jersey criminal code here, but two counts of vehicular manslaughter, while under the influence of alcohol. I did track down a summary of the law and penalties on a New Jersey attorney's web site:
Vehicular manslaughter is a crime involving the death of a person other than the driver due to the criminally negligent operation of a motor vehicle.
...
In New Jersey, the severity of your penalties for vehicular manslaughter will vary depending on whether there are aggravating factors. Generally, it is charged as a second-degree indictable crime with a sentence of 5 to 10 years of prison time and up to a $15,000 fine. In most cases, prison sentences must be served without parole, serving three years of special parole after release.
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In cases involving driving while under the influence (DUI), the court must impose a minimum prison sentence and a driver’s license suspension of five years to life. Additionally, you will face vehicle forfeiture, meaning the vehicles involved in committing the offense will be seized. If it is deemed as a first-degree offense, you can face between 10-30 years of imprisonment, which must be served without parole, requiring five years of special parole after being released, and a fine of up to $20,000.