A ROBINSON 44 PLT ENTERS THE CLASS D AIRSPACE OF POC ARPT WHEN HE FOLLOWS THE WRONG FREEWAY IN SEARCH OF RIVERSIDE.

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I WAS ENRTE VFR FROM VNY TO RIVERSIDE. AFTER TRANSITIONING EL MONTE CLASS D; I WAS PROCEEDING SE FOR POMONA FREEWAY EBOUND FOR A TRANSITION OF ONT TO RAL. AS BEST AS I CAN DETERMINE; I ACCIDENTALLY FOLLOWED THE 210 NBOUND THEN E ON THE 10 INTO BRACKET CLASS D. WHEN I CALLED ONT I WAS INFORMED THAT I WAS NW OF FIELD INSTEAD OF SW WHICH I EXPECTED. THE POMONA FREEWAY TRAVELS NE THROUGH ROLLING HILLS. I MISSED THE EASTERLY TURNOFF. ONT TWR ASKED ME TO CALL BRACKET TWR ONCE I WAS AT RIVERSIDE AND PROVIDED ME WITH NUMBER. ONCE I HAD COMPLETED LCL GND RESPONSIBILITIES; I CALLED BRACKETT TWR. CONTRIBUTING FACTOR: WX CONDITIONS WERE MARGINAL FROM 2-6 MI VISIBILITY; DEPENDING ON ATIS FACILITY AND 400-600-1000 FT AGL CEILING. POOR VISIBILITY COULD HAVE CONTRIBUTED TO CONFUSION IN NAV. PLT: I HAVE FLOWN RTE SEVERAL TIMES WITH STUDENTS PRIMARILY XCOUNTRY REQUIREMENTS. I HAVE 1000+ HRS; NO ACCIDENTS TO DATE. THE FLT WAS EARLY IN MORNING SO FATIGUE COULD HAVE BEEN A FACTOR. WE WERE HURRYING TO ARRIVE BY XA00; SO THIS MIGHT ALSO HAVE CONTRIBUTED (WE HAD 20 MINS TO COMPLETE 10 MINS OF FLT). GEOGRAPHICAL CONFUSION: THIS IS A VERY CONFUSING AREA FOR NAV. FREEWAYS RUN PARALLEL. GND MAY OBSTRUCT VIEW OF INTERCHANGES. FLAT AREAS HAVE FEW DISTINGUISHING FEATURES. RECOMMENDATIONS: I BELIEVE STRESS MAY HAVE CONTRIBUTED. I WILL REST MORE PRIOR TO FLT AND ALLOW MORE TIME; ESPECIALLY IN QUESTIONABLE WX; OR NOT FLY FLT DUE TO WX. ALSO SINCE TWR OPERATOR INDICATED THIS CONFUSION IS A COMMON OCCURRENCE; RESTRICT BRACKETS AIRSPACE TO THE S TO THE 10 FREEWAY. POSSIBLY MODIFY VOR/GPS-A APCH ACCORDINGLY.