Questions tagged [roadway]

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How do "Your Speed" Signs work, and how do vehicles know when it's the sign's turn to display their speed?

I see these LED speed signs on the side of the road, which display the approaching vehicle's speed. What I have gathered is that they measure the time between the sending and receiving of the signals ...
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3 answers
134 views

Why are roads sometimes extremely slippery after rain fall?

We've had 5cm of rain in the last week. Yesterday and early this morning it rained. During the morning commute the roads were still wet, but not it was not actively raining. The temperature was $7^{\...
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1 vote
1 answer
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Can Pavement ME Design be used to other areas besides USA and Canada? [closed]

I live in Asia and would like to use Pavement ME Design for my research. Can the current version of ME Design be used for that? Please give me the answer.Many thanks in advance.
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1 answer
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Why have they stopped having curbs on streets? [closed]

Growing up, roads always used to have a clearly separated sidewalk with a height difference. All new streets I see have no such curbs/height differences. Instead, it's just one "blur" of ...
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How far have we developed eco-friendly tyres alternatives?

Considering how bad rubber tires is for environment (Microplastic on tyre - NatGeo), Today tires consist of about 19 percent natural rubber and 24 percent synthetic rubber, which is a plastic polymer....
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3 votes
4 answers
156 views

Speed breaker design

Speed breakers are safety devices that keep check on the fast-moving traffic. But what does the speed breaker do when the vehicle is already slow approaching. Is there any better breaking system ...
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2 answers
96 views

Tiled/block pavement used to pave high traffic roadway?

We're normally paving the high-traffic road with concrete or asphalt. While for sidewalk/garden, we use pave block/tiles (either concrete or else) Common reason is because pave block/tiles doesn't ...
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1 vote
1 answer
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Are storm drains put after road has been finished and asphalted?

Local government has been doing main capital city road reconstruction for a year now (had to be done in 3 month originally, but it is out of budget and out of time as usual). They have finally opened ...
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  • 111
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1 answer
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Why do the sidewalks on USA roads use big, massive stone plates instead of asphalt?

Roads in the USA use asphalt, like every other country. However, the sidewalks don't use asphalt. Instead, they use enormous, gigantic square blocks of some kind of stone material. Where I live, the ...
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1 vote
2 answers
363 views

Banking progression in NASCAR tracks

the Bristol Motor Speedway is 0.533 mi long racetrack. The road is banked and circular. The straights are banked to 6–10° and turns to 26–30°. I have made a small diagram for ilustration. Before the ...
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2 answers
97 views

NASCAR corners on public roads

Why don't engineers build highways with corners such those on NASCAR speedways?
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1 vote
3 answers
265 views

What kind of splines should be used when planning roads?

I would like to plan a small road network for an imaginary city, and I am looking for a way to create curved road segments. I am familiar with cubic Bezier curves, but I am not sure if it's the best ...
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2 answers
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How do enginners build highway interchanges ? Are highway interchanges build based on a mathematical theory such as braids and knots theory?

I am trying to find how do enginners build roads especially highway interchanges. Are they relying on any topology theories such as braids and knots theory? Is there any connection or link between ...
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3 votes
1 answer
131 views

Does rain cause Tarmac / asphalt pot holes? If so, how?

Does rain cause Tarmac / asphalt pot holes? If so, how? After a period of rain in my city there are plenty of fresh new pot holes in the Tarmac / asphalt surfaces. The immediate cause is obviously ...
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3 votes
1 answer
89 views

Street Light Arrangement Method

Hello I am a high school student and I am curious about how street light is arranged along the road. Is there government laws to install street light on the road or is the arangement of the street ...
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1 answer
115 views

Vehicle load factor discrepancies

I am doing research on the impact of vehicles on roadways, specifically garbage trucks. In my research I am finding largely different "answers." For example "Using American Association of State ...
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  • 131
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1 answer
126 views

What would be the implications of a metal highway design? [closed]

I'm an engineering enthusiast but I don't yet have a formal education in engineering and I'm hoping you guys can tell me about the implications of using a metal road design in terms of durability and ...
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3 votes
3 answers
2k views

Are crushed cement stones and additional digging necessary when repaving a road?

These days the city is repaving the main road close to my office. Looks like the rainwater drainage system is being upgraded and curbs and drains are added to manage the flow of rain water. Few casual ...
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10 votes
7 answers
4k views

Why do we pave roads instead of making them from removable parts?

If roads were made of removable parts, we'd probably have fiber cable internet everywhere by now I'd say. It'd be so much easier to install e.g. new electricity and water infrastructure and to ...
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20 votes
2 answers
2k views

Why are earthfills fully covered in concrete where they join bridges?

Here's how a typical earthfill carrying a roadway joins a typical bridge Parts of the earthfill slopes are greenish - that's grass - and parts are whitish - that's concrete. The earthfill slope is ...
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12 votes
2 answers
2k views

Why do earth cuts sometimes have steps on their walls

A neat image from Wikipedia: There're clearly visible steps on the cut wall. This makes the cut wider at the top and so requires more work so those steps have some serious reason behind them. What's ...
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  • 2,089
5 votes
2 answers
691 views

Term for double slope from street

One of the places I frequent recently had the curb and sidewalk rebuilt by the city. Previously, there was a roughly continuous transition from the street to the rest of the private drive next to the ...
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6 votes
1 answer
2k views

Does passenger car traffic actually damage roads?

Pavement Design In roadway pavement design, the (US) controlling design load is usually the Equivalent Single Axle Load (ESAL). This number attempts to quantify how much bending stress a given ...
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