Ramp Control on I-35E: A Review of Operational Experience 1970-1977

This ramp control project extends along southbound I-35E from Little Canada Road to Maryland Ave. (see map on page 5). Pre-timed ramp control signals were activated at Maryland Ave. and Wheelock Pkwy. in October, 1970. Traffic responsive ramp control signals were activated at Roselawn Ave., T.H. 36 (leg and loop of cloverleaf) and Little Canada Road in November, 1971. At the same time the pre-timed ramp control at Maryland Ave. and Wheelock Pkwy. was revised to include traffic responsive features. Each ramp controller operates on an isolated basis with no interconnect to other interchanges. The system usually operates from about 7:00 to 8:00 A.M., Monday thru Friday.

This report presents an evaluation of the first seven years of system operation.
The following data were gathered:
1. Freeway volumes, speeds, travel times, and accident experience.
2. Entrance ramp volumes, delays, and ramp control violation rates.
3. Alternate route volumes and travel times.
4. System maintenance records.
5. Information on comments from drivers.