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→A4: Pedestrian conflicts |
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Traffic exiting the freeway to the arterial road is provided with a long, relatively straight exit ramp, preventing most speed-related rollovers. These exit ramps are also frequently multi-laned to accommodate traffic turning left, right, or going straight ahead in some cases. Traffic signals are commonly installed at the end of the exit ramp to regulate the freeway traffic flowing onto the arterial.
The parclo A4 is particularly well-suited to suburban areas with high traffic levels. Ontario freeways throughout much of the southern portion of the province, especially freeways in the [[Golden Horseshoe]] and [[Ottawa]] area, use the A4 parclo. These interchanges also exist on some highways in the [[Montreal]] area. One issue in suburban areas is the presence of three conflict points in each direction for pedestrians and non-motorised vehicles, the first of which is a moderate speed, low visibility conflict.
Caltrans favors this form for some recent projects, for example the reconstruction of [[Interstate 880 (California)|I-880]] and other highways in the [[San Francisco Bay Area]] and the [[Greater Los Angeles Area]]. They often replaced previous full cloverleafs. All exiting traffic for both directions has a relatively straight ramp and is controlled by a traffic light. Running off the road on an entering ramp is much less likely than on an exiting ramp. [[Ramp meter|Metering lights]] are a common feature on the entering ramps.
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