Abstract
The study is concerned with investigating delays and queues in both flow directions of exclusive U-turn median openings zone. Note that other turning movements are not allowed at exclusive U-turn median openings zone. Travel time delay study was carried out at four sites in Johor, Malaysia. Resultsshow that average delay of 5s can be expected at divergingsection and no significant delay to conflicting traffic flows at the merging section. Delayswere recorded for vehicles waiting to merge at the exit lane. The paper concluded that weaving may be called to account for travel time delay at the diverging section. And also that since vehicle at the merging section must give way, there will be no delay to conflicting traffic flow.
Highlights
Midblock U-turn facilities at signalised and priority intersections are very commonly found along federal highways in Malaysia
There are three issues to be resolved ; travel time delay at the diverging section of the median opening zone, travel time delay at the merging section of the median opening and travel time delay at the uturn exit end of the median opening
It’s up to the drivers at the exit lane to get the timingright.As shown in Table 2, loss time, queue and travel time delays are present at the diverging section of the median opening zone at all sites suggesting that midblock facilities can be partially responsible
Summary
Midblock U-turn facilities at signalised and priority intersections are very commonly found along federal highways in Malaysia. Median openings at commonly found along multilane highways in Malaysia; they are often built as direct or indirect U-turn midblock facilities with single entry and exit lane, IDRA Road layout Design (2011). Since Malaysia drive on the left hand side, it is conventional wisdom that motorist turn right at median opening. Often U-turn traffic movements at roadway segments are channelized and aided with splitting islands so that drivers can be on their desired trajectories. Drivers will have to keep to the right lane; decelerate when diverging, accelerate when converging These dangerous manoeuvres beg the question; ‘what are the induced traffic flow consequences when the lead vehicle decelerates or accelerates abruptly?
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