AMP: 0 Location: SR 503 and I-84, Hartford SR 503 is a long ramp to Sisson Avenue. AMP: 0 Location: SR 503 and Sisson Ave, Hartford SR 503 ends at Sisson Ave. Stay straight for Park Ave. E to I-91/US-44, W to SR 504 W to SR 504, E to I-91/US-44