Puerto Rico Highway 203 (PR-203), also known as the Expreso Chayanne (after the artist who lived in San Lorenzo, Puerto Rico, as a child), is a highway which connects Gurabo, Puerto Rico at PR-30 with its parallel route Puerto Rico Highway 183 in San Lorenzo.

It is the main route to San Lorenzo and is about 7 kilometers long.

It is a dangerous highway, as steep grading is present going down and then going up.

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