May 25 (UPI) — With the United States and Iran reportedly nearing a peace deal, oil prices fell slightly below $100 per barrel early Monday, suggesting optimism from traders to start the week.

Gas prices also declined slightly in the United States in the last week, but remain above $4.50 per gallon for regular on Memorial Day.

President Donald Trump has indicated that negotiations are “proceeding nicely,” and Iran acknowledged that talks have progressed but that a deal has not been reached, The BBC reported.

In European trading, Brent crude dropped to $95.04 per barrel and WTI futures dropped dropped to $91.02 per barrel — both declines of more than 5% — the Wall Street Journal reported.

Even with gas prices high, The Hill reported that more than 39 million people were projected to travel the roads during Memorial Day weekend, even as gas prices have remained consistently high since the start of the war in Iran.

Regular gas on Monday averaged $4.50 per gallon, which is down $0.01 from one week ago, but still $0.40 higher than one month ago, AAA reported.

Similar, diesel averaged $5.59 per gallon on Monday, which is down $0.03 from one week ago, and $0.40 more than one month ago.

“Memorial Day travel is still reaching record levels, but with the smallest year-over-year increase in more than a decade,” said Tiffany Wright, spokesperson for AAA’s The Auto Club.

“Although travel demand remains strong, higher fuel prices and persistent inflation may cause some travelers to shorten trips, delay plans or stay closer to home.”

The longer that the United States and Iran take to agree on a peace plan and the Strait of Hormuz remains closed, gas prices are unlikely to decrease significantly and energy markets will take a while to get back to normal, Axios reported.

“Gas prices are currently falling, but until we see an agreement signed and a significant amount of ships transit the Strait, the national average prices of gasoline will likely remain well above $4.00 per gallon,” said Patrick De Haan, head of petroleum analysis for Gas Buddy.