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    <p>Using <code>geom_rect</code>:</p> <pre><code>Vehicles &lt;- structure(list(Road = c(1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 3L, 3L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 3L, 3L, 3L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L, 3L, 3L, 3L), Start = c(157398137L, 216984017L, 238298694L, 0L, 8794530L, 59852594L, 206737339L, 218695178L, 96301465L, 116345621L, 157398137L, 216984017L, 238298694L, 0L, 8794530L, 59852594L, 206737339L, 3469683L, 96301465L, 116345621L, 157398137L, 216984017L, 238298694L, 0L, 8794530L, 59852594L, 206737339L, 218695178L, 231142027L, 3469683L, 96301465L, 116345621L), End = c(166811234L, 238298694L, 247249719L, 8794530L, 26703134L, 73085123L, 218577503L, 231142027L, 115456078L, 126898764L, 166811234L, 238298694L, 247249719L, 8794530L, 26703134L, 73085123L, 218577503L, 56797911L, 115456078L, 126898764L, 166811234L, 238298694L, 247249719L, 8794530L, 26703134L, 73085123L, 218577503L, 231142027L, 241946296L, 56797911L, 115456078L, 126898764L), Vehicle = c("1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "2", "2", "2", "2", "2", "2", "2", "2", "2", "2", "3", "3", "3", "3", "3", "3", "3", "3", "3", "3", "3", "3")), .Names = c("Road", "Start", "End", "Vehicle"), row.names = c(NA, 32L), class = "data.frame") set.seed(42) Vehicles$overspeed &lt;- runif(nrow(Vehicles),0,50) Vehicles$overspeed &lt;- cut(Vehicles$overspeed,c(0,20,30,Inf)) roads &lt;- read.table(text="Road Length 1 529290651 2 249139323 3 298024420",header=TRUE) library(ggplot2) p &lt;- ggplot(Vehicles,aes(xmin=as.numeric(Vehicle)-0.4, xmax=as.numeric(Vehicle)+0.4, ymin=Start,ymax=End,fill=overspeed)) + geom_rect() + facet_grid(Road~.,scales = "free_y") + #ugly hack to get correct road lengths: geom_rect(data=roads,aes(ymin=0,ymax=Length,xmin=0.4,xmax=1.4,fill=NA),alpha=0) + scale_y_continuous(expand=c(0,1)) + xlab("Vehicle") + ylab("Distance") + theme_bw() + scale_fill_manual(values=c("(0,20]"="blue","(20,30]"="yellow","(30,Inf]"="red")) print(p) </code></pre> <p><img src="https://i.stack.imgur.com/0DRR4.png" alt="enter image description here"></p> <p><strong>Edit:</strong> Following @Tyler Rinker's comment, you can reverse the scale like this:</p> <pre><code>p + scale_y_reverse(expand=c(0,1)) </code></pre>
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    1. COHow do I change this so that Distance goes from lowest (at top) to farthest (at bottom) for each road?
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    2. COThis is a better approach than mine. Use: `scale_x_reverse(...)`
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    3. CO@TylerRinker How can I change this so that the lengths of the rectangles plotted by `geom_rect()` are proportional to the corresponding road lengths? Therefore, the length of the rectangle for road 1 will be `529290651/249139323 =` 2.124477 times the length of the rectangle for road 2, etc.
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