The existing Interstate-215 is a 6-lane highway with three lanes of travel in each direction. The I-215/Case Road/SR-74 Interchange consists of two "diagonal" ramps and two “loop” ramps with the intersections being signalized. Each of the four ramps is a single lane of travel with an 8-foot shoulder on the right side of the travel lane. There are no pedestrian facilities (curb ramps, sidewalks, bicycle lanes) within the project limits. There is an existing drainage culvert structure located beneath the southbound offramp that will not be impacted by the proposed project.
The existing southbound offramp has one through-lane and one free right turn lane with a channelized median. The southbound offramp will be widened up to approximately 16-feet to accommodate two (2) through lanes, a dedicated right turn lane, and an 8-foot shoulder. The channelized median will be removed, which will improve safety for pedestrians and bicyclists.
The existing southbound onramp/SR-74 has one left turn lane and one through lane. The proposed improvements will widen the approach to the intersection approximately seven feet to provide two left-turn lanes, one through lane, and a six-foot bicycle lane.
The existing Bonnie Drive at southbound ramps has a single left turn lane and a free right turn lane with channelized median. The street will be improved to remove the channelized median and provide one left turn and one right-turn lane. ADA ramps will also be constructed at both the northwest and southwest returns at the intersection. A signal modification will be required at this Bonnie Drive and SR-74 intersection to accommodate the additional widening and bicycle improvements.
The existing SR-74 between the I-215 southbound and northbound onramps contain two-lanes of travel in the eastbound direction with a single lane of travel in the westbound direction and does not have bicycle lanes. The project proposes to maintain said lanes in both eastbound and westbound directions, with additional widening up to eight feet to accommodate 6-foot bicycle lanes on both sides of the highway.
The improvements are needed to ensure the local roadway network will be improved to facilitate better traffic circulation once traffic is realized from the South Perris Industrial Project Site 3. In addition, it will improve traffic operations, safety for pedestrians, and bicyclists.
Additional improvements include regrading of existing slopes, removal of existing pavement sections, grind and overlay pavement rehabilitation, construction of retaining wall and relocation of existing signs. The maximum depths of excavation will be up to 15 feet for the traffic signal poles and the road improvements will require approximately two to three feet of excavation. The proposed improvements are all located within existing Caltrans right-of-way.