ZPass New York website briefly crashed Monday morning due to high user traffic, one day after Manhattan’s high congestion pricing toll took effect for drivers entering the busiest parts of the city. E-ZPass New York said the crash was due to “higher than normal activity” around 9:45 a.

New York’s new toll for drivers entering the center of Manhattan is starting up after it withstood years of political wrangling, a last-minute pause and a flurry of legal challenges.

The new toll, up to $9 for passenger cars at peak times, is intended to support public transit, reduce traffic, and help emergency vehicles move faster.